MobileRead Forums - View Single Post - MacOS Stuck on Initializing User Interface

afthvanderheijde · 03-31-2026, 10:30 AM

Hi, my calibre is not working anymore.

When I start the application it gets stuck on 'initializing user interface'. I tried reinstalling, using an older version and using a preview version. Nothing works.

I also ran '/Applications/calibre.app/Contents/MacOS/calibre-debug -g'. This is the output:
ApplicationPaletteChange event ignored
Using calibre Qt style: True
[0.00] Starting up...
[0.02] Showing splash screen...
[1.18] splash screen shown
[1.18] Initializing db...
[1.21] db initialized
[1.21] Constructing main UI..

So again here, stuck on constructing the UI.

I'm on Calibre 9.6.0, but as I said, the older versions don't work either.
I'm on MacOS 26.4.

Any help possible? Thanks in advance?

03-31-2026, 10:30 AM	#1
afthvanderheijde Junior Member Posts: 1 Karma: 10 Join Date: Mar 2026 Device: Kobo	MacOS Stuck on Initializing User Interface Hi, my calibre is not working anymore. When I start the application it gets stuck on 'initializing user interface'. I tried reinstalling, using an older version and using a preview version. Nothing works. I also ran '/Applications/calibre.app/Contents/MacOS/calibre-debug -g'. This is the output: ApplicationPaletteChange event ignored Using calibre Qt style: True [0.00] Starting up... [0.02] Showing splash screen... [1.18] splash screen shown [1.18] Initializing db... [1.21] db initialized [1.21] Constructing main UI.. So again here, stuck on constructing the UI. I'm on Calibre 9.6.0, but as I said, the older versions don't work either. I'm on MacOS 26.4. Any help possible? Thanks in advance?