There is also a bug that crashes the Video Splitter in all versions (as far as I could test) after v3.7.1308.2.Beta, when trying to change the language on MKVs containing two languages (did not try with more).
The error message says: "Encountered an improper argument." - Then the usual Windows problem message comes up and that's it.
The error does not occur with: v3.6.1301.16, ..., v3.7.1304.29.Beta, ..., v3.7.1308.2.Beta;
But with (at least): ..., 3.6.1308.22, ..., v3.6.1309.3, ..., v3.7.1309.12.Beta, ...
Tested with dual audio MKV, containing french MP2 192 kbits/s + german AC3 448 kbit/s. Sample: http://www71.zippyshare.com/v/29467299/file.html