My guess: You started the game with a version prior to 1.33, and your saves became corrupt after installing the 1.33 patch between 22nd April and 1st/2nd May. The new patch, though the description has not been updated brings the game to 1.34, but all 1.33 saves are corrupt.

Lar's explanation for black maps/resetted worlds

Raze made a fix by data.000 file swapping, click here

Teleporting anywhere with the hex-editor by Raze, click here

Kiya

Oh, dear, I'm very sorry, forgot: Welcome to the forum <img src="/ubbthreads/images/graemlins/wave.gif" alt="" />