Wow--could the 1.5 update have been any more rough? :)
Here is 1.55--a full install to keep everyone on the same page. This fixes the lap count bug on the GP layout (which was being caused by a mistake in the garage paths), moves the apex tires away form the track a bit to allow a couple wheels in the grass, and also adds the apex tires (and some other things) to the HAT file to prevent them being cheated (shame on you guys :) ).
There's also a few other fixes that you all brought to my attention. Please see the readme for a full list.
To my knowledge everything that has been mentioned as "broke" or "bugged" is now fixed. This should be the last update for this track until V2.0 sometime in the future...