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mdhuang · 04-19-2019, 08:48 PM

Sorry to bring up this old thread, but Google brought me here

Got the same problem, Calibre hangs at starting up "initializing user interface".
Solution:
1. Uninstall Calibre
2. Delete AppData\roaming\calibre (AppData is a hidden directory under your user home directory, normally C:\Users\[your_user_name].
3. Re-install Calibre

It should work now!

How did I find this out? The portable version always works on my PC, and I figured there was some old stuff which was not compatible with the newer version of Calibre. And I found that.

UPDATE: only delete gui.json under AppData\roaming\calibre is good enough for me.

04-19-2019, 08:48 PM	#9
mdhuang Bookworm Posts: 113 Karma: 154 Join Date: Aug 2007 Device: Sony CLIE NX80V, PRS-500	The real solution Sorry to bring up this old thread, but Google brought me here Got the same problem, Calibre hangs at starting up "initializing user interface". Solution: 1. Uninstall Calibre 2. Delete AppData\roaming\calibre (AppData is a hidden directory under your user home directory, normally C:\Users\[your_user_name]. 3. Re-install Calibre It should work now! How did I find this out? The portable version always works on my PC, and I figured there was some old stuff which was not compatible with the newer version of Calibre. And I found that. UPDATE: only delete gui.json under AppData\roaming\calibre is good enough for me. Last edited by mdhuang; 04-21-2019 at 04:34 PM.