Restore does nothing, just blank page

Issue Summary

Hi,
first of all really great module, am using it on every single page I'm running.
I updated one site and installed the latest dev version 6.x-2.x (25 Feb '11) (by the way, why are so many dev modules release on that date???) but for me the restore is not working at all. For testing I just do a manual backup (which is no problem) and restore it right away. I don't get any error message, nothing in the logs, just a blank page and the restore didn't happen. I traced it all the way back to filters.backup_restore.inc Line 139 in function restore():

It just seems to die there without any notice. Have been programming in PHP for some years now, but that is one hell of a line. So I'm basically done here.

I went back to the stable release and it just works fine there, but thought I let someone no. I also compared it to the stable release, the line above is just missing there. Without the line the restore runs, and now that I think about it I guess it even worked then (testing was a bit messy, and I thought it didn't work, but I guess it did, sorry not much help).

Thanks for the great work!