Oops, my bad. I was wrong, the solids do have polygonal collision. but solids only work with objects that have the platform or 8-direction behaviors. i was programming movement through the event sheet (not using behaviors) so the solid behavior didn't work: things went right through. perhaps the dev team will fix that next release. for now, i have added an 8-direction behavior, put the default controls to no (making it useless) and collisions work :D. thanks guys!