OrCAD Allegro incompatibility causes board DRC errors in OrCAD?

Hi, I open a board design file of one of NXP's SABRE boards with OrCAD PCB Designer (Standard). Then I immediately update the DRC report, and to my surprise, I get about 3700 DRC errors. NXP has done layout with Allegro. I wonder if there is some kind of incompatibility between the tools, causing huge number of DRC errors in OrCAD. Has anyone experienced something like this?

I'm using PCB Designer (Standard) v.17.2.021 now. With v.16.6 the number of DRCs was about 10000.

- Kari