diff --git a/CLAUDE.md b/CLAUDE.md
index 4ec7bbf..dff668c 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -145,6 +145,17 @@ First build downloads AGP/Compose/Shizuku from Google Maven + Maven Central.
   Shizuku, **toggle Wireless debugging off/on** — Shizuku keeps running (separate process), a fresh
   port + mDNS record appear, and the beacon/connector recover. Plan the Shizuku-tier dev loop
   around this (or USB, if ever available).
+- **A poisoned Gradle *build cache* entry can silently drop a whole module from the APK.**
+  Symptom: the app dies with `ClassNotFoundException` for a class that plainly exists, while the
+  build is green and `./gradlew :app:dependencies` lists the module on `debugRuntimeClasspath`.
+  The module's own jar is correct; its code simply never reaches AGP's intermediates. `clean`,
+  `rm -rf */build` and `--rerun-tasks` all fail to fix it, because **none of them touch the build
+  cache** — look for `compileKotlin FROM-CACHE` in the log. Fix: rebuild with `--no-build-cache`.
+  Verify by grepping the APK's dex for a string literal that only that module defines; grepping for
+  a *class name* proves nothing, because callers carry the name as a reference whether or not the
+  class is packaged:
+  `unzip -o -q app-debug.apk "classes*.dex" && grep -a "pin-sha256:" *.dex`
+  Suspect this whenever a runtime failure contradicts a successful build.
 - **Empty-jar race with the IDE.** VSCodium's Java/Kotlin extension runs its own Gradle daemon on
   the same project; when it overlaps a CLI build, a module's `build/libs/*.jar` can end up
   containing only a manifest, and Gradle then considers `jar` up-to-date. Dependent modules fail
diff --git a/echolot-app/app/src/main/kotlin/app/echo_lot/app/RunViewModel.kt b/echolot-app/app/src/main/kotlin/app/echo_lot/app/RunViewModel.kt
index e2114b3..2160fcc 100644
--- a/echolot-app/app/src/main/kotlin/app/echo_lot/app/RunViewModel.kt
+++ b/echolot-app/app/src/main/kotlin/app/echo_lot/app/RunViewModel.kt
@@ -285,7 +285,11 @@ class RunViewModel(app: Application) : AndroidViewModel(app) {
             state = state.copy(
                 pendingEnroll = PendingEnroll(
                     link = link,
-                    currentServer = settings.serverUrl,
+                    // Compared against the link's URL, which names the server publicly — so this
+                    // has to be the public name too. Using the endpoint made re-enrolling with the
+                    // same server look like a move to a different one, because the endpoint and
+                    // the public name are deliberately different strings.
+                    currentServer = settings.serverPublicUrl,
                     newServer = target,
                 )
             )