Okay, I'll try it.
My boxes or 48 by 48, so, wouldn't be 49 and -49 instead of one?
+ System: For each Block_Green
+ Block_Green: overlaps Green : offset (49,0)
+ System: OR
+ Block_Green: overlaps Green : offset (-49,0)
+ System: OR
+ Block_Green: overlaps Green : offset (0,1)
+ System: OR
+ Block_Green: overlaps Green : offset (0,-1)
-> Block_Green: Set 'Connected' to 1
[/code:340uggyb]