@wanghongtao: I'm not seeing that. If you can reproduce this in Troubleshooting Mode (Help → "Restart in Troubleshooting Mode…”), can you provide exact steps to reproduce it from a Zotero startup? Also please provide a Debug ID for Zotero startup through reproducing this, using the "Restart with Logging Enabled…" option.
https://s3.amazonaws.com/zotero.org/images/forums/u3793727/56gwwfjm8bx8ex8gtlmm.png