Failed to load map C:\seq\maps\postorms.map: Object reference not set to an instance of an object

Tried deleting seq folder, and appdata\myshoweq and then re-extracting and running... same error.

It shows the spawn list on the left all good but the map area is just grey.

This problem occurred right after i pressed a combination of keys. I was trying to control alt delete but i think i may have pressed some other keys.

SOS please send help