Well, there's that and the fact that zdoom/gzdoom update the savegame version numbers when upgrading the SVN repo. However, like DBT said, if you didn't upgrade then it's a problem with your load order.This'll happen if you play with non-vanilla maps for sure.
"well, im not too sure. I mean, we made money, but im not able to wipe my ass with $100 bills yet." - DBThanatos
"And one for Bobo the Space Monkey!" - Postal Dude
"My grandmother could beat the game if she saved as much as you do!" - Postal Dude
"Float... They aaaaaall float! And when you're down here with me, fat boy! YOU... float... too!" - Pennywise, the Dancing Clown
"In Offline Gaming We Trust" - DBT & MC
"That truck is fucked." - FPS Russia
Spetsnaz. When the only way to kill a terrorist is with a back-flipping Apache attack.