Can you provide a Debug ID for Zotero startup through reproducing this, using the Help → Debug Output Logging → "Restart with Logging Enabled…" option?
Can you just post raw screenshots directly? Too hard to see that. Also, I'm not sure what's going on with your windowing — the citation dialog appears to have been made huge and is cut off at the bottom. Can you resize it to show the full window?
24767514
Submitted with Debug ID D1857174040
https://s3.amazonaws.com/zotero.org/images/forums/u20801411/7j60lpmx01tid8fczdhl.jpg