Members having problems replying to PMs
 

Two members report that they are having problems replying to personal messages between them. Works okay until they reply a third time in a thread of PMs back and forth, at which point they get a 404 error.

I have no idea why this would be happening. We had a backup restoration on the 19th but I have accomplished PM threads with three or four replies since then.

Any ideas?

Natalie