Whenever I open the map creator,it's just a dark screen,however,it still works normally,but you can't see anything because the screen is black.

Help please!

The latest version ( 1.3.8 ) should have two executables for the Map Creator; MapCreator 1.3.6.exe (pre-1.3.7) and MapCreator.exe(1.3.7 and beyond). Try both.
Heck, if you're on an older version, grabbing 1.3.8 might just be enough.