I'd recommend removing everything, restarting and then re-adding the application and port exceptions.
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Just to clarify... When you disable Comodo, you get a Success on the test but when it is enable it reports a Failure?
Yup, and no firewall rule, nor app setting as trusted helps on that in Comodo.
As stated, delete all your FG releated rules/settings. Restart your computer, then re-add them. Their are reports that sometimes security program rules/etc are tied to specific versions of the applications (i.e. based on cheksums, dates or sum) and the rules that appear to be correct really won't work as intended.