Earlier today I tried to import a .swf into Flash CS6. Every time I do this, the application crashes.
There is a problem with CS6 and APFS. The only solution I know is to put the Flash Pro folder onto an external HFS+ drive. When you do that, and run Flash Pro for the first time, there may be a message about the application having moved, and it offers to fix something. Let it fix it, and then you should be able to run Flash Pro, and import things without crashing.
Ok, thanks for your help. I thought it might be because CS6 doesn't have full functionality on newer operating systems.
I do have a external HDD, so hopefully it works.