The thing that happened was I opened the save dialog (of the plugin), pressed okay and got an 'are you sure you want to overwrite' dialog - after pressing okay I got the crash. What made the crash strange is that after trying to reopen the song it crashed immediately on loading. I removed the plugin, tried opening the song and everything went well. Then I moved the plugin back and tried reopening the project and it loaded.
I was running version 2.7b6 on windows xp, AMD athlon 64 3200+ processor with 1gb ram, soundcard: Novation Nio.