Hi all,
I had some issues with list generation as well, Minwah suggested changing the 'list_generation_method ' from 'rom_folder_vs_listxml' TO 'rom_folder_vs_xml2info'
This was early in the beta version of 162.12b so I'm not sure it still applies - but it's worth a try It worked fro me). This is dependant upon which version of MAME you're using. I think Minwah said that if you're using up to Mame v0.106, to use 'rom_folder_vs_xml2info method' since xml2info.exe is supplied with Mame versions up to this version.
What does your log file say?
Cheers,
Breaker.