The status line several times changed between "removing assemblies" and
"processing assemblies" while the build process was still in progress and a
bunch of popups signaled all sort of exceptions -- and the build process is
now frozen (or so extremely slow that it doesn't come to an end).
R# works well with small HelloWorld programs (~ 5 projects) but not with
real-world apps (20+ projects).
Just try building Orchard (rebuild solution since there are not many
dependencies between projects):