The first thing you need to do is get the specs of the machines that your apps don't appear to be running on. Just because Vista is installed, doesn't mean it's Vista's fault. Ask for graphics hardware, VRAM and driver versions.
I develop in BMax under Vista and don't have any problems at all, nor have I experienced any problems with other peoples' games/apps that I have tried in the past. I don't really have time to test your games right now, but I'm pretty sure I won't have any issues with them.
The only thing to note with Vista is that it is more important than ever (especially at the moment) to ensure that a user is aware that their graphics and sound drivers need to be up to date. I suspect that this is where your users are having problems.
I develop in BMax under Vista and don't have any problems at all, nor have I experienced any problems with other peoples' games/apps that I have tried in the past. I don't really have time to test your games right now, but I'm pretty sure I won't have any issues with them.
The only thing to note with Vista is that it is more important than ever (especially at the moment) to ensure that a user is aware that their graphics and sound drivers need to be up to date. I suspect that this is where your users are having problems.