Today I came across an annoying issue with a CS3 file that I had edited a month ago. I was required to make simple edits so I re-opened the fla file. It crashed every time I tried publishing, saving or simply viewing the action tab and could not figure out why. After hours of debugging I finally fixed the problem by simply copying it from the network to my desktop. Basically every time I tried opening the fla file from the network it crashed. I don't have an exact reason why this is happening because other files work fine, however this is the solution to fix it.