hi all,
first i hope this is the place for asking about it,
so, i started a project with cs6, saved the file in cs5 and i sent it to a diffrent machine,
then i open the file in cs5 and continuing working, after a while i saved the file, and closed it.
i try to open it again and my flash cs5 crash and will not respond.
i opend the problamatic file with cs6 with no problams, i was trying to locate the problams with save in cs6 and reopen in cs5 when trying to get rid of stuff that making the cs5 crash,
i finally succed to open the file with cs5 when the problam discoverd was a tween with guideline that when you try to change it (ease or layer level) the cs5 just crash and get not responding again.
so i reset the tween and delete the guideline and the problam solved, and now i working on cs5 just fine, after a while and a faw saves (only in cs5) i closed the program.
this is the frustrating part.. when i try to open the file again in cs5 the problam is back!!! it crashing and not responding, i cant understand why, i only worked on cs5 after the problam solved.
i open this file with cs6 with no errors, but i cant open it with cs5 anymore, im not going to try and locate the reason again its taking me a lot of work time.
im sure that is somthing with easing and tweening that im not realy understand.
i updated flash,deleted the preferences folder and all the thing that need to be done with no succes! 
i have cs6 at work and cs5 at home so i need this problam discoverd and solved for a clean way to work in the future.
please help me!!!
thanks in advance,
kiko.