Can you post a minimal input file that will re-produce the error along with the exact commands you are issuing to make the plot.
Also what version of FEAPpv do you have, which OS version, which compiler version?
Regarding visualization in other programs, we do not have that in FEAPpv.
The full version of FEAP has a paraview output option but there is not one for FEAPpv.
You can of course write the entire solution to the output file: stress,all ; disp,all etc.
and then parse it yourself. Jonathan Wong has some started code that may be helpful
http://www.jonjwong.com/paraview.html