When loading a character that is a wizard at 21st level and have the requirements for Archmage the sheet doesnt register the archmage levels and displays the XP for next level as if they were not there, so three levels of archmage the character is 24 however the XP thinks the character is 21 still and allowes levels to be added, when it shouldn't. This also happens with another character who is a thief 21 and assassin 6, I will include characters so that you can check them. If its something I am doing feel free to contact me.
windows vista, java 6 or java 7
The characters do exhibit the issue, but new characters created in current versions of PCGen do not. The supplied characters can be corrected by editing the pcg file (not something I would normally recommend)