Studio Toolbox uncklickable

Hi there,

i have just installed SuiteCRM Version 7.8.7 (Sugar Version 6.5.25 (Build 344)) on my server.
Everything works fine except the studio.

There are two problems:

  1. I cannot click the buttons in the toolbox (screenshot 1)
  2. I can move the fields around but they dont stay where i want them to stay (screenshot 2)

Does anybody have an idea how to fix this problem ?

Thanks in advance !

Greetings, Volker