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Tested on a clean install of test18. Also noticed on test17. Haven't needed to update email account properties in a while so I don't know what version it actually showed up in. After editing the properties of an email account, the account tab is not redrawing properly. Only the currently selected account and the buttons are visible. Going to a different tab and returning to the Accounts tab makes everything display properly again. This also happens when you select "Set sub-folder locations" on the Folders tab. It does NOT happen when choosing the "three dot/ellipsis" (...) buttons on either the General or Appearance tabs. Attached is a screenshot showing the problem.
Created an attachment (id=24) [details] The accounts tab after editing properties
I've seen this as well...
This was caused by an InvalidateRect call in the wrong place.