Problems after update from 4.1.5 to 4.2.0 (WYSIWYG & Profile Page)

[ub.ch]

Hi!

I updated from 4.1.5 to 4.2.0 and now the WYSIWYG is not working anymore.
Everything else seems to be working fine, but the WYSIWYG is not showing anything.

The JS console has the following output:

PHP Code:

This browser is AJAX compatible vbulletin-core.js:11
Creating array vBulletin.elements["vB_Lightbox_Container"] vbulletin-core.js:11
vBulletin.elements["vB_Lightbox_Container"][] = post_preview, 1 vbulletin-core.js:11
Firing System Init vbulletin-core.js:11
Fire vB_XHTML_Ready vbulletin-core.js:11
Fetch Cookie :: vbulletin_collapse = '' vbulletin-core.js:11
Dep Ctrl: subscribe vbulletin-editor.js:11
Dep Ctrl (deps_x) FAIL: subscribe_deps vbulletin-editor.js:11
Checkbox rating vbulletin-editor.js:11
Dep Ctrl: rating vbulletin-editor.js:11
Fetch Cookie :: vbulletin_collapse = '' vbulletin-core.js:11
Uncaught TypeError: Cannot read property 'value' of null 


also the profile page of a user is empty; if I go to
example.com/members/16283-ub
I get an empty page, no error or whatever

I hope you guys can help me out or point me in the right direction!

THANKS!