Or more specifically, the "Grail Quests Retail" portion of the AddOn is causing the issue. The game still loads and the program resumes working, but it is annoying. If I uncheck the box for "Grail Quests Retail" in my AddOn list in-game, the issue stops.

Going back to version 106 "fixes" this issue, but of course, that means I don't have the stuff for the newest patches.

I deleted the Cache, Interface, and WTF folders, and reinstalled Grail and having it be the only AddOn installed but the issue still persists even after removing all previously saved settings. The only thing I haven't done at this point is to reinstall the entire game, and that isn't something I want to do. I'd rather not have to set up the game and all of my AddOns again.

There are no Lua error boxes that appear on screen, but when I did a fresh install of Grail after deleting those 3 folders I mentioned, I did get a message saying the AddOn was out of date and that I should disable the AddOn.

I have released Grail 110 and Wholly 079 which delay some of the start up processing which should make it faster to start, and therefore not have the issue that I assume you are getting. Please check them out to see whether your issue is solved.

The loading is faster like you said. But the Issue still persists but to a lesser degree. The screen will do that fade to white thing, but it only lasts for a second or two.

I have released Grail 110 and Wholly 079 which delay some of the start up processing which should make it faster to start, and therefore not have the issue that I assume you are getting. Please check them out to see whether your issue is solved.