QTR-Quadtone RIP

Hi all,

Suddenly, QTR creation curve tool crashes on my PC (Win XP) while creating the curve. The following message pops up in a window:

Qdotgain did not return a valid curve at quadprofile.pl line 90
Curve Creation failed.

It has been working well for more than a year, but now, for any qidf file (I tried many of them), it crashes.
I was using QTR 2.6.2, so I upgraded to 2.7.2 in order to get brand new files, but it did not change anything...

Any help? Pleaaase.... :o(

Sylvain