That's not a lot of information you're giving us to go by...
Which platform, which version, what are you trying to import? Images, video, illustrator files?
The new CS4 doesn't seem to like Illustrator files, but I've been told they're working on a fix at Adobe.
General notice: from now on, I would like to ask everyone to put [AS2] or [AS3] (corresponding to the version of actionscript you are using on your project) in front of their post titles when the question is actionscript related! Please help us help you faster. Thank you.
_ System is Windows XP with service pack 3 and full diagnaotic recently (Dell Dimension 8300 with new ATI Diamond graphic card 256MB)
_ Flash CS3 is the only version crashing (did the same both before and after the diagnostic)
_ none of other CS3 programs exhibit import or other problems
_ Crashes when attempting to inmport - doesn't even get to the directories to choose a file - just hangs with timer for few seconds then in a flash it's gone and gotta reboot program.
_ can cut and paste from photoshop to Flash without crash (strange huh?)