Using Windows 7 Ultimate 64bits. Tried all browsers.
This happens on 1 of the .capx I have after I installed the new r88.
When I preview the game I'm getting these error screens, if I click OK or close, another one pops up. The game appears to advance 1 frame after closing and before a new message appears.
<img src="http://i.imgur.com/sFvel.png" border="0" />
<img src="http://i.imgur.com/qzff5.png" border="0" />
If I check the box that says "Prevent this page from creating additional dialogs" the game continues normally but a little different than it used to. For instance on Chrome it appears to work normally but the collisions are a bit off, on Firefox the sprites don't move at all (8 Direction behaviour).
Can you share your .capx?
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I've narrowed down the problem. On the events, look for:
GreenSquare is overlapping BottomRails.
Change BottomRails (family) to Rail.
And the problem is gone. It might have something to do with families.
Oops, you're right, the message appears with family overlap events. The message appears to be completely spurious - you should be able to ignore it (check the "prevent this page creating additional dialogs") and the game should then work normally. Sorry, will try have this fixed in another release soon :P