Hello, I have the same problem. I use screen offset for scrolling, and apparently, if screen position is not 0,0 (upper left corner), sprite/bob collision did not work. Also, even if I "hide" sprites 6 and 7 out of screen, as manuals reccomended when using hardware scrolling, and so they are not used for computed sprites, sometimes sprite is weirdly changing colours. There is option of using direct hardware coordinates for sprite collision, but it only work witch hardware sprites, so I was left with only 6 sprites for use (1,2,3,4,5,8). Actually, with scrolling screen, I use bobs only.
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