Hi.
With Postprocessing, quality control set to Max, and Nic's checked all available ffdshow x64 builds at "SVN builds by clsid / 64-bit builds" produces slide show (big frame drops) on this video sample:
https://rapidshare.com/share/56B860048CD264A2EDF23555BEC8D188
The bug does not exists in the x86 versions with the same settings.