I finally found out what was wrong

I have a Fanatec CSW v2 Base and the BMW rim, so I use the latest FanaLEDS v2.3, I also had FanaLEDS start with Windows....So, I turn off FanaLEDs, and now my Sli Pro with SimDash is working fine, I turn on FanaLEDS, and SimDash stops working

My guess is, since I did have SimDash v6 working with FanaLEDS, it must be down to the update of FanaLEDS software, no other games are affected, only Nascar2003. Anyway, seems I can't run both at the same time like I would rather do
I will also post this at FanaLEDS Forum, and see if they can do something about this

Thanks for the help guy's
All the best...
Swifty