I have just found that the nightly build for R# 6.1.38.146 is expired and there appears to be no current runnable R# 6.1 version that is compatible with StyleCop 4.7.6.0.
I am now about to roll back to ReSharper 6.0.2202.688.msi
The ongoing discussion is at
http://stylecop.codeplex.com/discussions/287847If you also have to roll back - please post a polite note at
http://stylecop.codeplex.com/discussions/287847