Joseph,
First, I'd like to say that GH 2 is a fantastic bit of software. It's easily the best labor of love type game I have ever played, and it's honestly more engrossing than 99% of commercial games out there. Keep up the good work!
On a less syncopantic note, I don't know if this is the right thread for bug reports on GH2 .622, but it seems to have turned into it. In that vein, I have a couple of things that may be bugs. If it's important, I'm running Vista on a relatively new Toshiba laptop with a dual core Athlon processor and integrated ATI graphics.
1. During the second "get a new lancemate slot" mission, the one where the guy shuts down the cavalier's club and threatens to duel anyone who enters the building, I ran into a group of his henchmen outside the spinner. The lead henchman (the one who initiates conversation with you) didn't have a mech, he just charged into battle wearing a spacesuit. When he gave his little speech about how his badass custom mech was going to destroy you, instead of the usual grandiose name, he just said something like "my mech". Predictably, he was shortly thereafter atomized by a railgun burst. If it will help, I can send you the save game where it happened.
2. If I use the 3d version, it crashes to the desktop with the following error if I try to enter a spinner interior. It doesn't do this in space, or during battle, or going from space to the spaceport, only if I exit a building. I've tried just about every possible combination of graphics settings, and they make no difference. The 2D version runs just fine. Also, I wasn't hitting Ctrl-C, and doing so doesn't seem to cause any problems.
An unhandled exception occurred at $0BC41B1C:
EControlC: Control-C hit
$0BC41B1C
$07EB772D
Thanks again for making this wonderful game, and if you need the savefile or anything, I'd be glad to shoot it your way.