as posted in VirtualBox forums:
https://forums.virtualbox.org/viewtopic.php?f=3&t=65475
Fedora's 'bleeding edge' distro "rawhide" has rolled out kernel version 3.19.0.0 today. Virtualbox guest additions 4.1.20 fail with desktop integation (only a ~1000 pixel horizontal resolution can be achived). Mouse integration and shared folder integration is OK. I *do have* rebuilt the guest additions after the kernel upgrade - just telling in advance in case somebody should feel like to ask!
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Hilsen / Regards
Peter Laursen