vray color material crashes...

It seems whenever I drag the slider in a vray material with Vray Color…I crash…It asks me to save a copy of the scene…but I does not respond…Anyone have this…
Thanx

Which 3dsmax/V-Ray version?

Best regards,
Vlado

Oops…Max 9 32 bit and 64 bit Vray 1.5 r3