Apologies - this is posted in wrong thread. I shared this info in the white screen of death support thread.
Im getting this problem with Joplin portable (installed last week), running on an external drive. Last week it worked fine. Now the log text shows loads of errors with the SQLite, and just a white screen nothing else loads.
UPDATE
I think I know what may have caused my issue: old temp files. Yesterday I disconnected the ext drive, and later plugged it back in. I think this broke the temp file structure for Joplin and therefore caused problems with the SQLite. Today I deleted everything in Joplin, inc cache and tmp folders and all my imported data. It still wouldnt start. But once Id deleted loads of windows temp files (in owner/app data/local), it started no problem.