I have the same issue. Also no logs as the process seems to quit when it reaches maximum available memory (24ish gb for me).
BUT I was able to keep it running further with the non 64 version. So just TexGen.exe worked for me. I assume the results are the same?
BR
Tr0u64d1x
Edit: I can second that "RealTimeLog=1" upon starting TexGen makes the TexGen Options menu not appear.
Edit2: TexGen.exe did however end up producing some out of memory error.