I run my GP4 on my simulator in the basement. I use a ten year old PC with XP and no internet. This is by design as I have many kids that come and go (the room also has a huge 1/32 slot car track) and I don't want to deal with the junk that accompanies PCs, kids, and the web. As such, I do all my downloading and most mod work pertaining to GP4 on my newer Win 8.1 laptop and transfer the files to my GP4 dedicated PC via flash drives. Overall, this system works fairly well. I copied a whole GP4 file to one 16Gig flash drive that is already setup with the GP4 patches and the GPxPatch. When I plug this in to my GP4 PC and run the game with the original setups and tracks, it works well. When I use the GPxPatch track setup feature to substitute some of the newly made tracks that have already been formatted into separate .wad and .dat files, these seem to work well, also, at least most of them. However, when I attempt to install and substitute tracks that have been downloaded using the TSM system, these do not work as the system simply blinks a black screen and closes the entire program. I also sometimes use the Trackinstaller program to setup and install tracks but this also does not work well as the new tracks substituted via this method do all kinds of strange stuff when loading such as using the wrong loading images, sometimes loading the wrong tracks, and/or simply shutting down s described earlier. My theory is that the Zaz Tools and the Track Installer, and even the Teameditor do not like my flash drive copied version of the GP4 program, even though the GPxPatch is OK with it. Does the Zaz Tools, Track Installer, Teameditor, and/or other mod programs somehow "get mad" when they see a GP4 that is not the original installed version on the C Drive? Perhaps a registry issue? I know that when I attempt to install a second copy of GP4 on my PC to an alternate folder (to keep one original and the second or third to use with the various mods and tracks) the GP4 install program does not want to cooperate as it either wants to modify, repair, or remove the original program that it sees is already there. Sorry for being a little long on this post. Any help appreciated.