The game updated to version 3.0 today, and something must have changed in the d2s file. I created a test character and tried to edit it in v0.33 and got a "Quest info data format error" message. I guess we'll need an updated version of the editor if possible.
The test character is a Barbarian. I haven't bought the "Reign of the Warlock" expansion yet, so I don't have a Warlock save file to give you.
Test.zip