Minimap turns black with a lower alpha.

[sacrife]

I haven't added this as in an addon yet, but just by doing
/script Minimap:SetAlpha(0.5);

However, this isn't important, what is important is that after like 5 seconds of moving, the minimap turns completely black and wont go back.
Only reverting it to 1 alpha it regains it's former self.

This has me stomped.

*edit*
By adding it as a line in a random addon, the minimap just spawns black. ;X