I was messing around with the Custom Subscreen and I went to go test it out in ZC, and it says that the quest that I was working on was invalid. I am trying to figure it out at this time, but this is what I know:
I was trying to figure out why the quest was invalid. And now I know it has to be becasue of the Custom Subscreen because when I try to open the quest back up in Zquest it says this:
Reading Custom Subscreen.........error
--Press any key to continue--
The thing is, I am trying to figure out what I did in the custom subscreen to make this happen since I can't open the file anymore. I remember I deleted the Big Map, and then tryed to add a new one. I changed the text of the invetory to a different text. And changed the bottom subscreen so the items are on the left and the mini map to be in the middle. Hopefully, I can figure out exactly what happen, but yeah this is a big bug.
So yeah, do make sure you back up the quest!