diff --git a/js/ui/profileModal/ProfileDirectMessageActions.js b/js/ui/profileModal/ProfileDirectMessageActions.js
index 9dd5cd4d..0e19cfec 100644
--- a/js/ui/profileModal/ProfileDirectMessageActions.js
+++ b/js/ui/profileModal/ProfileDirectMessageActions.js
@@ -88,7 +88,7 @@ export class ProfileDirectMessageActions {
         }
       },
       onPublishRelays: async (urls) => {
-        return this.handleDmSettingsPublish(urls);
+        return this.controller.handleDmSettingsPublish(urls);
       },
     });
   }
@@ -170,7 +170,7 @@ export class ProfileDirectMessageActions {
       const previewUrl =
         typeof URL !== "undefined" ? URL.createObjectURL(file) : "";
       this.controller.dmAttachmentQueue.push({
-        id: this.generateAttachmentId(file),
+        id: this.mainController.generateAttachmentId(file),
         file,
         name: file.name,
         type: file.type || "application/octet-stream",
@@ -182,7 +182,7 @@ export class ProfileDirectMessageActions {
     });
 
     input.value = "";
-    this.renderAttachmentQueue();
+    this.mainController.renderAttachmentQueue();
   }
 
   async handleSendProfileMessage() {
@@ -250,7 +250,7 @@ export class ProfileDirectMessageActions {
       let attachmentPayloads = [];
       if (hasAttachments) {
         try {
-          attachmentPayloads = await this.uploadAttachmentQueue(
+          attachmentPayloads = await this.mainController.uploadAttachmentQueue(
             this.controller.helper.resolveActiveDmActor(),
           );
         } catch (error) {
@@ -279,7 +279,7 @@ export class ProfileDirectMessageActions {
 
       if (result?.ok) {
         input.value = "";
-        this.resetAttachmentQueue({ clearInput: true });
+        this.mainController.resetAttachmentQueue({ clearInput: true });
         this.mainController.showSuccess("Message sent.");
         if (this.controller.enableNip17RelayWarning && result?.warning === "dm-relays-fallback") {
           this.mainController.showStatus(
@@ -294,7 +294,7 @@ export class ProfileDirectMessageActions {
       const errorCode =
         typeof result?.error === "string" ? result.error : "unknown";
       userLogger.warn("[profileModal] Failed to send direct message:", errorCode);
-      this.mainController.showError(this.describeDirectMessageSendError(errorCode));
+      this.mainController.showError(this.controller.describeDirectMessageSendError(errorCode));
     } catch (error) {
       userLogger.error("[profileModal] Unexpected DM send failure:", error);
       this.mainController.showError("Unable to send message. Please try again.");
@@ -322,7 +322,7 @@ export class ProfileDirectMessageActions {
       this.setDirectMessageRecipient(remote, { reason: "thread-select" });
     }
 
-    this.setFocusedDmConversation(conversationId);
+    this.controller.setFocusedDmConversation(conversationId);
 
     await this.controller.renderer.renderDmAppShell(this.controller.directMessagesCache, {
       actorPubkey: actor,
@@ -364,7 +364,7 @@ export class ProfileDirectMessageActions {
     const recipient = this.controller.helper.resolveRemoteForConversationId(conversationId, actor);
     const messages = this.controller.helper.getDirectMessagesForConversation(conversationId, actor);
     if (recipient && messages.length) {
-      void this.maybePublishReadReceipt(messages, {
+      void this.controller.maybePublishReadReceipt(messages, {
         recipientPubkey: recipient,
       });
     }
@@ -425,7 +425,7 @@ export class ProfileDirectMessageActions {
       const recipient = this.controller.helper.resolveRemoteForConversationId(conversationId, actor);
       const messages = this.controller.helper.getDirectMessagesForConversation(conversationId, actor);
       if (recipient && messages.length) {
-        void this.maybePublishReadReceipt(messages, {
+        void this.controller.maybePublishReadReceipt(messages, {
           recipientPubkey: recipient,
         });
       }
@@ -561,7 +561,7 @@ export class ProfileDirectMessageActions {
         const errorCode =
           typeof result?.error === "string" ? result.error : "unknown";
         userLogger.warn("[profileModal] Failed to send direct message:", errorCode);
-        this.mainController.showError(this.describeDirectMessageSendError(errorCode));
+        this.mainController.showError(this.controller.describeDirectMessageSendError(errorCode));
         this.controller.dmComposerState = "error";
       }
     } catch (error) {
@@ -582,7 +582,7 @@ export class ProfileDirectMessageActions {
 
     const actor = this.controller.helper.resolveActiveDmActor();
     if (!actor) {
-      this.clearProfileMessages();
+      this.mainController.clearProfileMessages();
       return;
     }
 
diff --git a/tests/dm-conversation-select.test.mjs b/tests/dm-conversation-select.test.mjs
new file mode 100644
index 00000000..01bccfdc
--- /dev/null
+++ b/tests/dm-conversation-select.test.mjs
@@ -0,0 +1,70 @@
+// Scenario (SCN-dm-open-conversation):
+//   Given the DM contact list is rendered,
+//   When the user clicks a conversation (onSelectConversation → controller
+//     delegate → ProfileDirectMessageActions.handleDmConversationSelect),
+//   Then it focuses that conversation and re-renders the thread WITHOUT throwing
+//     — i.e. it must call controller/main-controller methods on the right
+//     receiver, not on the Actions instance (the bug that made opening any
+//     conversation throw "… is not a function" — KNOWN_BUGS #0 follow-up).
+
+import test from "node:test";
+import assert from "node:assert/strict";
+
+const { ProfileDirectMessageActions } = await import(
+  "../js/ui/profileModal/ProfileDirectMessageActions.js"
+);
+
+test("handleDmConversationSelect focuses + renders via the correct receivers", async () => {
+  const calls = [];
+  const renderer = {
+    renderDmAppShell: async (...args) => {
+      calls.push(["renderDmAppShell", args.length]);
+    },
+  };
+  const controller = {
+    dmMobileView: "list",
+    activeDmConversationId: "",
+    directMessagesCache: { conversations: [] },
+    helper: {
+      resolveActiveDmActor: () => "actor-pubkey",
+      resolveRemoteForConversationId: () => "remote-pubkey",
+    },
+    renderer,
+    setDirectMessageRecipient: (...args) => calls.push(["setDirectMessageRecipient", args[0]]),
+    setFocusedDmConversation: (id) => calls.push(["setFocusedDmConversation", id]),
+  };
+  const mainController = {};
+
+  const actions = new ProfileDirectMessageActions(mainController, controller);
+  // Actions.setDirectMessageRecipient delegates to controller; keep the real one.
+
+  await actions.handleDmConversationSelect({ id: "conv-123" });
+
+  assert.equal(controller.dmMobileView, "thread", "switches to thread view");
+  assert.equal(controller.activeDmConversationId, "conv-123", "sets active conversation");
+  assert.ok(
+    calls.some(([m, v]) => m === "setFocusedDmConversation" && v === "conv-123"),
+    "focuses the selected conversation on the controller",
+  );
+  assert.ok(
+    calls.some(([m]) => m === "renderDmAppShell"),
+    "re-renders the DM thread",
+  );
+});
+
+test("handleDmConversationSelect ignores an empty conversation id", async () => {
+  const controller = {
+    dmMobileView: "list",
+    helper: {
+      resolveActiveDmActor: () => "actor",
+      resolveRemoteForConversationId: () => "remote",
+    },
+    renderer: { renderDmAppShell: async () => {} },
+    setFocusedDmConversation: () => {
+      throw new Error("should not focus on empty id");
+    },
+  };
+  const actions = new ProfileDirectMessageActions({}, controller);
+  await actions.handleDmConversationSelect({ id: "   " });
+  assert.equal(controller.dmMobileView, "list", "no-op for blank conversation id");
+});