Latest version, but uhh it doesn't say :p
OS is WinXP Pro 32-bit.
Herostats worked fine to detect that I was on and do stats and such before City Game Tracker stopped working. I'm not sure if it worked just before, as I was using CGT instead. Then CGT stopped working (crashed on opening) so I tried to use Herostats, it didn't see me as online, and it hasn't since. This was weeks ago at least.
This makes no sense to me, so it probably means that there's an installation problem somewhere. That's usually the culprit when stuff stops working for no reason.
I'd suggest this. Uninstall HeroStats, CGT, TNT, and anything else related to those (such as HeroLCD if you have that). Also uninstall the .NET Framework version 2.0. Reboot. Download the latest HeroStats (unstable version, as that's the only one working with CGT right now anyway) and install it - this will also reinstall the .NET Framework. Reboot again. Now run CoX and HeroStats and see if you're recognized as online *in HeroStats* (not CGT yet).
If it works up to that point, then you can configure your options to connect to CGT, try TNT, etc.