I have to continually delete and setup gmail accounts to drop messages into Reminders. Why?

I noticed yesterday that I lost the ability to drop Outlook messages into Reminders. I deleted the account from Mail preferences and then created the account again and it worked fine. Today, I had the same problem, only with Gmail messages. I've deleted and setup the account several times today. I can drag messages into Reminders for a short period of time, and then I lose the ability again and again. Additionally, I don't see the subdirectory for my Gmail accounts in the Reminders column, although my Outlook account does appear. What is going on??? Anyone else having this issue?