The "filterFolderDeniedLocked" message ("The messages could not be filtered to folder '%S' because another operation is in progress") appears all too often, and doesn't appear (to an un-savvy user like me) to be triggered by anything in particular. Thus I don't know what I could do differently to make it go away (apart from not use filters). When it happened to me just now, I had ~190 messages in my POP3 box, and it generated that message for *each e-mail* for probably the first 40 messages. (Then presumably the lock became available, because the message went away). So, my request(s): - if possible, can the message just not be shown at all (silently wait until the lock is available, or whatever) - otherwise, if we take it as read that the message *must* be shown, then - can it only be shown "once per download", rather than for each message? - can it be reworded to explain that "some messages in your 'XYZ-Inbox' folder were not filtered".
*** Bug 173675 has been marked as a duplicate of this bug. ***
I haven't seen this error message for several weeks, so I assume it's now fixed.