The fact you get this .vfs.corrupted file is normal.
HFS has an auto-restoring feature, that will use a backup file in such case.
Looking at the source code i just noticed the backup is not actually loaded, just renamed. Next beta will fix this bug.
In the while, if you got this corrupted file, then you should get also the correct vfs on place (although it is not loaded). So the it shouldn't be a problem.