Nuendo 7 32bit will hang on startup when it gets to the Steinberg hub. It is not the case with the 64bit version. If I load into 64bit, close then open 32bit it will load but if I load straight to 32bit again it will hang. The work around is to disable Steinberg hub in general preferences.
One note is that my machine is offline from the internet so my thought are that it maybe trying to look local then online, times out and does not stop trying.
Hope that helps.