[Killa[DGZ]]

I've experienced this before when performing lengthy calculations using large numbers (someones money) and during the calculation the variable exceeds variable restraints and rolls over into a negative value before the full calculation is complete.

After that all my commands returned "Server: Unknown Command" and my filesystem "Y_ini" either swiped (cleared) accounts used thereafter or didn't work at all.

Maybe your issue is like mine, in which case you're looking for an account that has a value that loads from file which exceeds variable restraints.

Possibly money.