What version of Flash? Are you saving over a network? What OS? If over a network what OS is the server? Are you writing to a single disk or a RAID? What format are you saving to, FLA or XFL?
You need more RAM or use less objects or smaller objects
Saving to Hard Drive via USB. Saving as Fla.
Smaller or less objects will not be possible but i guess i can devide the fla in more parts and put them together in Premiere or After Effects later.
Still its just a 15 sec animation (this part) but ok, quite complicated with a lot of characters and stuff.
But the bottomline: this is probably a memory problem? Working on an iMac 2 Gb 667 MHz DDR2 SDRAM with 2.8 Ghz intel core 2 duo, which is on the list of replacement by a newer one Will not be able to buy a new one before my deadline so i guess i have to solve it somehow for the coming week.
(Will closing all other open software even small ones like mail and twitter help?)
2Gb maybe is not enough, in windows you can increase the virtual memory to help in these cases, but do not know if iMac have that option
If the object exists during your authoring then the system has enough RAM to save it properly, Flash just must not be warning you it had an issue saving. That would be a bug. You should easily be into SWAP (HD used as memory) territory. While 2GB ram is very slim and RAM is dirt cheap, it should not be corrupting during save.
Closing down everything you don't need running will always help. That includes gadgets, widgets, email, browsers, IMs, etc etc. If you close it all down and save works, Adobe just needs to fix the save function to notice when memory limits are corrupting data.