Dunno what to tell you, but it seems fine here. No crashes, no nothing.
Whats your CPU/GPU?
Do you have Hardware Accelerated Decoding active in MC17? And if so, does turning it off make a difference? (Or on, when it was off?)
For Windows 7, the crash dialog there looks quite stupid, too. Usually it offers some information on what module caused the crash.
Also, to rule some things out, maybe you can try with 0.48? (You can find some older versions here: http://code.google.com/p/lavfilters/downloads/list)
I have two totally different machines both quad core, one with AMD 6670 and the other with Intel integrated graphics. If I simply swap the LAV splitter for the integrated splitter within MPC-HC it works just fine as does WMC. Senna has also posted with the same issue!
Just to be sure we are referring to the same source the files size of part one is:
Size=6.27 GB (6,740,905,313 bytes)
Size on disk=6.27 GB (6,740,905,984 bytes)
Is there a way to log crash data from LAV