I am having a severe problem with this version of ethminer!  I never got Failure: GPU gave incorrect results ever before!  This Genoil appears to be unreliable first time using it. it ran good for a while than stopped mining with that error.

Windows 7 x64
Sapphire Vapor-X R9 280x 3GB
XFX R9 380x DD Black Edition 4GB

I have not had a failure with the original ethminer but I am using the switch -S with this one which the original does not have.

ethminer -G -S coinotron.com:3344 -O username.workername:workerpassword

original line is ethminer.exe --farm-recheck 200 -G -F http://coinotron.com:3342/username.workername:workerpassword

What could be possibly wrong?  This happened only after several hours of running.