I recognized a problem after upgrading from Seafile server 6.3.4 to 7.0.2 CE. When using the web site everything looks fine except one thing. Whenever a pop window should occur (creating libraries, files or even showing server version etc.) nothing happens. I’ve tested it with firefox and chromium.
When I downgraded again to 6.3.4 everything is fine.
For those, who interested in the root cause:
I used a modified css-style based on the example linked in the Seahub customization section of the seafile manual. After removing this modified css-style everything is working fine again.