I have the same question... It plays when checking out a toplevel project ($/Projects)
Below that is ok ($/Project/Demo1) works
-- EDIT: Solved
With patience the files started appearing after all. I know for sure that it had finished before, but that was on a copy of SSEXP started from withing visual studio 2008. Perhaps some memory restriction plays a role (makes it fail for large volumes of trees with many files, without displaying a proper error message?).
Anyhow, redoing the get from a SSEXP started with Visual Studio closed (and applying LOTS of patience) worked for me in the end