In using the 2/2005 build of WinPFGW, I am getting the following
errors with -gx -a2

141*2^570401+1 ERROR DURING PROCESSING! (0.3154s+2611.4880s)
141*2^572007+1 ERROR DURING PROCESSING! (0.3150s+0.0022s)
33*2^600270+1 ERROR DURING PROCESSING! (0.3139s+5828.9821s)
5*2^1282755+1 ERROR DURING PROCESSING! (0.7384s+6238.0862s)

This happens consistently. -a1 works fine, but -a2 fails. The reason
I'm testing with -a1 and -a2 is that WinPFGW misses GF factors of some
primes when neither -a1 nor -a2 are used.

--Mark