LCD Tire color stuck

I'm getting this bug especially with '60s cars:
LCD, tire monitor, all the tires "icons" are pale green/blue color,
and are stuck, so they do not show heat up (change to red / yellow color)
when you drive them (hard). They stay always pale green/blue.

Temp readout figures below each tire icon change the right way.

My system spec:
core i5
4 GB ram
GeForce 8600 GT
Win7 x64

with F3.5 I usually get the right behaviour when displaying tire temps icons colors

 

It's been like that since the start, can happen with any car on any track at any time, seems to be totally random.

 

Glad someone reported this. I was going to as it happens randomly to me too.

 

It's been reported about 10000000 times by now, no reason to bring it up anymore. They're well aware of it.

 

Yesterday I discovered one funny thing, the left tire icons were "functional", changing color according to tire load/temperature, right icons were stuck to gray/blu color...