By the way, where do you have netKar PRO installed? I would like to see the full path like "C:\Program Files\...", because this may be the root of the problem.
This issue appears only when you chanhge something in "settings -> simulation". All other settings don't have (at least this one) negative effects.
So you need to delete "...\My Documents\netKar PRO\cfg\options.ini" file again or open it in Notepad and delete the very last string "REPLAYMIN=15" (number may be different) as I said before.
In last case you will not able to record replays, but game should work
To be honest most of those tracks looks not so good if you will compare them with original ones, but it's just a question of time when its quality will be good.
UPD: Yeah, Mugello is the only one high quality track at the moment from my point of view
I'm glad that you've finally found some good AUS stuff
For sure Uncle Ken I will take it, but only after I will find some mutual love with Mazda and Lotus 79.
Skippy was a good school for me - I've spent 3 months to learn "hell & toe" - it dropped my times for about 4 seconds down, but I've gained it back now
By the way, I just don't understand how to make GTR cars do not eat damn tires
Try to correct folder' permission if you have Windows 7/Vista and NKP is installed in "Program Files":
Right click on NKP folder -> Properties -> Security tab -> Edit (in the right of "To change permissions click edit") -> Choose "Users/..." in list -> check in "Full Control" and "Modify" -> click Apply and OK.
I had the same "freezes" issue and tip posted above helped me.