Sorry for the late reply, don't get much time to mess around with this due to work commitments. So i deleted everything and started again from scratch, with a fresh install of Launchbox 10.9. I'll explain my setup a bit better to see if that sheds any more light on the problem. I have my main C drive which has 2 partitions, C for Windows and D for Launchbox. I then have an external usb 3 hdd which has all my roms on it. When i imported the roms i kept them on the usb drive and i left the settings as recommended by Launchbox to create the lists for the Arcade Category, i.e. Capcom classics etc. And again the same thing is happening some are launching and some aren't, what i have found out is that if i double click a game, take 1941 as an example then it wont play, but if i right click on it there is a list of different revisions of the same game and one of those does work, but this doesn't work on every Rom with different revisions and some haven't got any revisions at all.
Thanks for your help guys