After upgrade to 7.10.9 studio no longer appears.
JS Console:
https://crmtest.ezs.ch/index.php?module=ModuleBuilder&action=index&type=studio 500 (Internal Server Error)
no errors in PHP / apache logs.
suitecrm.log shows these two lines:
Fri Oct 12 18:44:11 2018 [17440][7098c295-4ea7-26fe-af1d-4dda14b75350][WARN] CSS File Dawn/yui.css not found
Fri Oct 12 18:44:11 2018 [17440][7098c295-4ea7-26fe-af1d-4dda14b75350][DEPRECATED] PHP4 Style Constructors are deprecated and will be remove in 8.0, please update your code
Any ideas?