Today i installed the new Version of parallels desktop for mac. Unfortunately the coherence mode does not work in the German version (3168 de). I finaly was able to get everything running including resolution changes on fullscreen using the vmtools.iso of the US version Parallels Desktop 3186 Mac en.dmg.You need to mount the dmg in finder, then follow this steps:

cd /var/tmpcp /Volumes/Parallels Desktop/Install Parallels Desktop.pkg/Contents/Archive.pax.gz .gunzip Archive.pax.gzcpio -i -d -IArchive.pax ./Library/Parallels/Tools/vmtools.isosudo cp Library/Parallels/Tools/vmtools.iso /Library/Parallels/Tools/vmtools.iso 

Afterwards mount the image in parallels using Device->CD/DVD->Image and select /Library/Parallels/Tools/vmtools.iso.Now inside your vm go to the cd-rom drive and run PrlTools.exe. Once everything is installed restart and your done 😉