Okay, so I've just discovered why it was happening for me.
In NT7, in browses, for local vars, you could leave the picture blank.
In NT8, if blank, it automatically assigned the string picture.
A lot of my local vars are XHTML-ified.
@s255 is NOT GOOD for big html strings, obviously
So this was fixed for me after going through my browse fields and putting a blank string instead of @s255 for the picture!