The problem occurs when an editor wants to create a certain block. It used to work.
Details:After clicking Create new block within a content area, I select my bad block -- and nothing happens. No errors in browser console, nor in episerver log. I would have expected a button Create beside Cancel-button.
All other blocktypes except this one works just fine.
I have checked the access level for creation of the block, and it is set to everyone.
I tried copying the code and changed the guid and name - and this one worked as well.
I suspect, that somehow data for this blocktype has been corrupted.
Does anyone have an idea how to fix this - or what the problem might be?
Found the error.
By accident, someone had added text outside an element in one of the language xml-files.
After we removed "at", it was possible to continue.
<description>dolor sit amet</description>