Hello!
I have had, the same problem, Tracks-5 crashes. I found two things, and after that, it hasn't happened.
In my langiuage we have characters above ASCII 127, suck as å,ä,ö. The same letters can be found in many other languages .
Naming the songs with these character, and importing them to Tracks works, BUT, the imported files are not exported to the directory of the project in the Audio directory, only files without these characters will be present. Also, if you export a file with odd characters, it crashes.
If a file with the same name is present in the directory, instead of a question to over write, it crashes.
After I changed the file names without characters above ASCII 127, and deleted the old files in the directory before exporting, it works pretty well and no crashes, at all.
Hope this will help.