
I did some editing last night with no problems.
This morning when I open my TW again, it refuses to save. The same behavior is found in chrome and Avast Secure browser.
Is it possible/likely that this is because I imported a PDF file which was copy protected? I did not change any of the html file attributes or try to save it using the browser "file: save" command. In fact, the yellow popup confirmed that the wiki was saved, but when I clicked the checkmark to save the entire file, the message above was presented.