Hello Openhab forum. I migrated yesterday from 5.1.0 M2 to M3. Now, the Android GUI only shows a blank page either in the OH App or in Chrome. I could bypass the problem with an invalid target URL. Example https://openhabian:8443/false . OH displays an error page including a ‘GO HOME’ link that…

I’ve been able to fix the issue: Fix blank screen if simple navbar is enabled main ← florian-h05:simple-navbar-blank opened 01:08PM - 23 Dec 25 UTC (UTC) [i…

Yes, in openhabian-config under the “openHAB” menu there should be an option to select the testing branch. I don’t have ready access to an openHABian install at the moment so can’t confirm or generate screen shots.

Under OpenHAB Related, one can install the latest Release, latest Milestone or latest Snapshot, but not a specific intermediate one.

Choose “latest milestone” then run the commands I posted above to switch to a specific version. If you could do it through openhabian-condfig you wouldn’t need the apt commands above in the first place.

Thank you Rich. I appreciate the time you take to answer - you as well as the other members of the forum. I installed the ‘Latest Milestone’ as you proposed (I did the same before for M2). I got M4 installed of course. I decided to give M4 a try (before using your apt commands to go back to M2). U…

[image] Sacha: I decided to give M4 a try (before using your apt commands to go back to M2). Up to now, M4 is OK for me (and of course no mor error messages about Invalid return statements). Great to hear you haven’t found issues yes. Just a heads up, there were still a few UI bugs in M4, but…

I’m still seeing the blank screen issue with the release version of 5.1.0. Disabling the use of Simple Navbar which I had enabled for mobile view solves the blank screen issue for me.

Cause you mentioned that there are still a few UI bugs in 5.1 - > do not know if this is related but this widget of mine does no longer render correctly.

Hello there, I am still facing the blank OpenHAB MainUI page issue from whatever client I do not have still a valid session from before the upgrade from 5.0.3 to 5.1.0. Every requested page results in a blank canvas, not only the overview (even error pages do not load). The issue persist after upd…

I will also add that to exclude other variables I did spin up a fresh install with the same 5.1.0-alpine container but empty volumes, and from there I cannot reproduce the issue. I then proceeded to stop and start the container restoring one volume at a time, and I am served blank pages only if I re…

[image] Procsiab: The issue persist after updating the org.openhab.ui bundle to the Jenkins pipeline result 1481 ( https://ci.openhab.org/job/openHAB-WebUI/lastSuccessfulBuild/artifact/bundles/org.openhab.ui/target/org.openhab.ui-5.2.0-SNAPSHOT.jar at the time of writing). Perhaps I misunderstood…

5.1.0.M3: Main UI shows blank screen on Android

Setup, Configuration and Use News & Important Changes

florian-h05 (Florian H.) December 26, 2025, 3:24pm 50

The 401 error when accessing a sitemap is “fine” as this is Main UI determining whether authentication token is required.
I can reproduce your issue when disabling implicit user role in API security settings. This is a different issue, but now that I can reproduce it is easy to fix (the fix took me 10 minutes):

myopenHAB online but MainUI not loading remotely (openHAB 5.1.0)