With the patch installed you can not quicksave when dead. A few people have done this by accident (or loaded an earlier save when they meant to save their progress). A couple changed from the default hotkeys for quicksave and quickload, to make it harder to accidentally mix them up.

The only way I know to fix this problem (EDIT: and by 'know' I meant 'guess') would be to hex edit a file in the save folder and replace the character data, as described in the topic I've been transformed into a rabbit!!!.
EDIT: this works to restore your character from polymorph traps, but not death.

Check your PM (click 'My Home' in the top menu bar, then 'Received Private Messages').