Hi Peeter,
regular PDF creation might still work without issues, I think it was PDF/A and/or PDF/X causing the issues.
Possibly it was also a bug in GS 9.25 which was then fixed in 9.26 (we needed to change the order of the parameters when calling GS). If you can generate normal PDF files from Office etc, it should work for all other applications as well. Maybe you just won't be able to create PDF/A or PDF/X.
Best regards
Robin