Got this when doing "write net xx.xx.xx.xx:pixname-pix". The PIX is running 7.2(2). Is this CSCsg87808? If so, it sounds rather drastic to have to remove all??? the "snmp-server" commands or downgrade.
%Error reading system:/running-config (Configuration line too long)
Yes, this appears to be the bug (assuming you have snmp-server commands). You should also get the same error doing a "write mem". An upgrade to 7.2(3) or 7.2(4) will fix it.