Yesterday everything worked fine, today when I turn on editing on any of my course pages it freezes completely. There is nothing I can do. Not even scrolling or clicking on any links. It seems like a screenshot from my site instead of a living webpage.
It was a clean 2.3 install from last week, today, when I encountered this problem I upgraded my site to the latest build successfully, but the error remained.
I tried different computers and different browsers – no luck... Since there is nothing really important I will be able to reinstall the whole damned thing, but it would be nice to know what went wrong so I can pay attention next time.