Paulski your best bet is to go to the PEDG forum dedicated solely to Panzer Elite and all its mods.The guys there Brit44Aldo, Bob1R and others are pretty handy and welcoming and will be able to help you.Here's the link,
http://pedg.yuku.com/forum/view/id/10
I have the game installed with all the mods and it's pretty good especially with all the improvements made.I am playing it sparsely as I am involved in Steel Fury and TvsT.My own assumption is a trigger that needs to be adjusted.I remember playing a mission and although I completed all the objectives still no success message.I drove around for a while and then just gave up and ended the mission.Check with Brit44Aldo on the PEDG forum he is the expert .
Cheers