By default, Proc Gproject uses the X & Y variables, and it assumes they are in radians, and the x value is "westlong".
I'm guessing the new map you downloaded has projected values in the X & Y, and therefore gproject is balking on them.
The new maps we've been shipping with SAS lately have unprojected values in Lat & Long variables, and are in degrees (rather than radians), and the longitude is in "eastlong" (rather than "westlong"). Therefore you'll probably need to specify those options with gproject, such as ...
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