I've seen this behaviour as well. I was working strictly locally at the time. The wiki appeared to hang up for a while and after it came back to normal started giving me that same error message whenever I tried to save or modify a tiddler.
To rectify the problem, I downloaded a new copy of the Empty wiki and imported everything from the misbehaving wiki. That gave me the same error message. So I tried again and imported everything except the last tiddler I had been working on. That worked and the new wiki performed normally. To restore the last tiddler, I opened both the misbehaving wiki and the new one, opened the last tiddler I had edited and manually copied the contents to a new tiddler in the new wiki. I closed both wikis. The misbehaving wiki retained its problematic behaviour whilst the new version has worked just fine. I concluded, rightly or wrongly, that the problem was a corrupted tiddler. -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/tiddlywiki. For more options, visit https://groups.google.com/d/optout.

