Upgrade from 6.3.2 to 6.3.3/6.3.4 --> Fault "django.request:152 get_response Not Found"

Hello togehter,

when I update my server from version 6.3.2 to 6.3.3 (or 6.3.4 - same behavior), I have some problems with seahub. The Login-Screen apears and I can enter my credentials. But, after this, I only see the rotating circle and nothing happens.
When I symlink back to 6.3.2, all is fine again. I found the following error in the seahub.log with the newest versions:

django.request:152 get_response Not Found: /media/assets/scripts/app/main.js

after a look at “/seafile-server-6.3.3/seahub/media/assets/scripts”, the app-directory isn’t there, so the log doesn’t lie. BUT: where is my fault?

thanks and best regards