[NTG-context] presentation styles empty front page

I have a problem with the presentation styles s-pre-xx. Since I used them previously (about 2-3 years ago) now an EXTRA blank page appears up at the front of the series of sheets. I am positive this did not occur in the past, since I did not change my files. Because I tried some different presentation styles and they all show the extra page, my suspicion is that it could originate somewhere in s-pre-00 (pre-general). However, I cannot find something suspicious in that file. What has happened? dr. H. van der Meer