Perform a quick upgrade to 0.43.1 Solved the problem for me. It was keywords-related to me. Which reminds me -- since I've got the keyword support disabled, is there any danger in blowing away the courierimapkeywords folder?
There's no danger, but it will be recreated automatically, and remain empty.
Keyword support should be left on as a default. The only reason it's possible to turn it off would be in an event some obnoxious bug pops up, and disabling keywords becomes a temporary quick fix.
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