Question about Outlook Express

I use Windows Live Mail 2011 on W7 Home Premium.  I have 4 POP3 and 2 IMAP accounts.

I am getting a a popup window indicating errors have occured, but no errors listed. The bottom status shows 5 of 6 Tasks were completed. When I click the tab to show "Tasks", 5 of the 6 accounts have status of complete and one account has no status. The account with no status is a POP3 account.  This occurs when Live Mail is doing a background "Timed" Send and Receive.

What I have tried. If I click the Send and Receive Button, all accounts complete without error.  If I use the Send and Receive pulldown and select the single account having the problem, it completes the Send and Receive without error.  I have done this hundreds of times without a failure. It only happens with the timed automatic Send and Receive.

If checked and double checked all account settings. All POP3 accounts have identical settings and all access the same POP3 server.  Both IMAP accounts have identical settings and are both GMAIL accounts.

I exported all email messages and deleted the account getting the error.  Rebooted the computer, loaded email, and let it run through several automated Send and Receives.  No error happened.

I recreated the account and the error returned.

Next, I tried rearranging the order of accounts in the left window.  No effect.

After rearranging account order, I once again deleted the account, rebooted etc.

Recreated the account and changed account order at the same time.  The account started working correctly, but Oh boy....

One of the IMAP accounts now now has the same problem!

This installation has been running without failure for about a year. The only clue I can think of is an experiment with "Picture" settings recently. Being annoyed by Live Mail's handling of pictures received in email when I forward.  I turned on the option for Coverting Photos to Photo emails. Used that for awhile to test and turned that option off.

Any experiences or suggestions?

Thanks!