Edward,(posted 9887 days ago)I presume its my 91530 recording you were trying to playback.
1) You need to make sure its Mame v0.33 Beta7 you use to replay. 2) You need to make sure you use 0 frameskip (you can unthrottle if you wish). 3) You need to rename the inp file to be < 8 characters prior to the . delimeter. ie: rename from bj_upndown_91530_m33b7.inp to upndown.inp (I now only rename the zipfile like most of the others are now doing. It used to playback with long file names but this support got dropped around v0.31.) 4) Make sure this file is in the \mame\inp directory.
You should now be able to playback the file ok. (Well I just did using Mame v0.33 Beta 7 anyway.)
Cheers, BeeJay.