Try these:
I removed the corner pixels because I'm pretty sure you can only have completely square boxes defined for the profiles.
no luck with that either :\
I'm going to try playing around with the images to see if I can get it closer to the original
edit: I used the raw base/client/ui/
blockScroll.png as ArkChatScroll2Profile and it still crashed.
edit edit: pin pointing the issue with raw images suggest that ArkChatScroll2Profile is entirely the one that crashes it. I can setProfile to ArkChatScrollProfile and GuiScrollProfile seamlessly without crash.
edit #3: Both profiles are exactly the same but with different names and bitmaps. I'm using two blockScroll.png's (original file made by Badspot) now for both of them, and it's still crashing just for ArkChatScroll2Profile.