Plextools prof. does not show emphasis-status

Big problem: Plextools prof (Vers. 2.35) does not show the correct preemphasis status (CD/DVD-Info). Even CDs having tracks with preemphasis, Plextools says NO.
It worked earlier, as I tested 2 years ago some CDs and the correct status was shown
What may be wrong?
Burner: Plextor Premium, W2k-SP4, latest firmware. Is it due to a firmware error?

I just copied a CD with mixed tracks - and: the tracks with emphasis do not have the emphasis flag (i.e. wrong frequency response!). The tracks are sweeping sinus tracks, thus I was able to measure the frequency response.