diff --git a/src-tauri/src/launcher.rs b/src-tauri/src/launcher.rs
index 310ecaf..0399158 100644
--- a/src-tauri/src/launcher.rs
+++ b/src-tauri/src/launcher.rs
@@ -2164,7 +2164,23 @@ impl Launcher {
     // comes up on the DHP's data instead of switching a moment later.
     let live_mode = config.upstream_url.is_some();
     if live_mode {
-      let token = self.site_access_token(app).await.ok();
+      let token = match self.site_access_token(app).await {
+        Ok(token) => Some(token),
+        Err(why) => {
+          // Said out loud: the operator named in launcher.json travels with a drive, the
+          // sign-in (Credential Manager) does not. A drive moved to another PC launches
+          // there as its operator and quietly shows that PC's data - the API's log was the
+          // only place that said "no DHP sign-in yet".
+          self.log(
+            app,
+            "warn",
+            format!(
+              "No DHP sign-in on this PC ({why}): ODIAN shows this PC's own data - no live aircraft, no tiles from the site. Stop ODIAN and sign in; a sign-in is kept per PC, so a drive moved to another one needs it there too."
+            ),
+          );
+          None
+        }
+      };
       self.write_upstream_token(&config.layout, token.as_deref());
     } else {
       // No upstream means none: a token left behind by a run that ended without clearing