Map Editor bugs

[CallumD]

Whenever I try making a vehicle the Map Editor either does nothing or makes a Sentinel regardless of the vehicle I choose. It's got to a point where I can't map any more vehicles now. I have always found Map Editor buggy but this major bug has been since MTA 1.0.2. I've tried re-installing MTA but that dosn't fix it. Does anybody know how to fix this?

EDIT: I notied this debug error when opening the "Create vehicle" menu:

ERROR: ..ods/deathmatch/resources/move_cursor/move_cursor.lua:58: attempt to preform arithmetic on upvalue 'minZ' (a nil value)