Since last night we have not been getting emails for activity on our own caches or those on our watchlist, no copies of email we sent through the website, and we ran a "My Finds" query that did not come through either.
I figured that the email server got backed up or something and that the email would be waiting for me this morning, but no such luck.
Since others are also having similar problems, I feel better that it is not something I did. Has Groundspeak posted somewhere that they are looking into this? I don't see anything from them on either of the threads I looked at.