Thanks for the quick answer, but unfortunately it didn't help...
You said:
1. For sidebar, please add widgets to bbpress sidebar.
I don't have any problems with the sidebar/ that was not the question.
2. If the issue is with the text editor, try writing in text mode: http://prntscr.com/acb8d0
As you can see from the picture, there's only a blank space where the editing area should be, both in visual and text mode. Plus my users don't want to edit on text mode - understandably enough. This is happening both in IE, Edge and Firefox (didn't try in Chrome).
3. Also, Try deactivating FEE from wp-admin->WPLMS
I'm sorry, but I don't know where to find 'FEE'. Can you indicate under which sub-tab it is?
Thanks,
Nataska