Yes, I know it's my add-ons acting up, though I did update all of them today that had any newer versions than Oct 23 (my last full add-ons update date). Greymind seems the worst offender, followed by Lorebooks and some part of the Wykkyd Suite. Googling for ways to mask the popups I find comments that it was fixed in Morrowind so we can no longer text-edit the settings file to increase capacity and the Shissa add-on that addressed this issue has been discontinued.
I'm fine with disabling a bunch of them, but when it comes to Wykkyd, I really rely on it. Especially the info bar at my screen top. Though it's not had a recent update, surprisingly enough. So I'd rather disable the pop up error messages and just deal with eventual possible game crashes after extended play. Does anyone know how to stop them from showing up while still utilizing add-ons? I'd like to level a character to see the guide and level rewards and a perpetual grey box in the middle of my screen makes that very difficult.