PaperUI Display Issue 2.5M2

Since 2.5M2 the PaperUI seems to me missing the Addons menu on the left. Any ideas?
Raspbian Lite Stretch with openHABian.


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I have it there …
what if you run



In the bottom right it popped up “503 Service unavailable”

Nothing in the logs.

OK, I found the answer here.

Clearing the cache & tmp folders restored the menu.