Flash Pro 5.0 suddendly starts duplicating everything, on stage, in library, even scenes

Question

After some time working with Flash, the program begins duplicating items in the Library (without giving them new names or just copying them), duplicating instances on stage, sometimes even scenes, until the program becomes unresponsive.
This always happens after working for a longer time. It's like someone invisible sitting next to you pressing "ctrl-D" like a monkey gone postal.
Apart from that, the program suffers from the dreaded "out of memory" bug (discussed in another thread). I coudln't believe that I was able to work more than 3 days without a crash using a special hack that would allow Flash to use > 2gb segments for memory allocation.
So what could be the cause of this? Could it be, that the document itself is corrupted or is it just a common behaviour of Flash CS5 to mess up everything if you're running it for "too long" in one session?
This is almost bringing my production to a halt, because the only thing I can to is to restart the whole system to have another "half hour" or so, befor the bug kicks in again. Or I could use Flash CS4, but what the f***k did I get CS5 for anyway then?!
So if someone experienced the same behaviour with Flash CS5, maybe you know a trick. I would really appreciate it!

Answer 1

Try file->save-as and save down to a CS4 document. Then try it. I've had a lot of really weird issues with CS5 in the past that saving down to CS4 somehow corrected. Although I use CS5.5 currently. Docs made in CS5 often don't even import into CS5.5 correctly. I need to go in CS5, open it, save down to CS4 and then reopen in CS5.5. There's something about saving down to CS4 that seems to fix things.
You can always save down to CS4, work in CS4 to make your changes then import it back into CS5 and export it.
In this world things are too complex and sometimes although it's not ideal, just getting it done for deadline is the real job.