I think the blinking is only for your own units. The black you see is the background of the units, and you can hide that as well if you like. Your units would continue to blink though, only they would blink from visible to invisible. Maybe the blinking can be turned off elsewhere. Unfortunately I haven't found any options for that yet.
@kongkim82: Go
I think the blinking is only for your own units. The black you see is the background of the units, and you can hide that as well if you like. Your units would continue to blink though, only they would blink from visible to invisible. Maybe the blinking can be turned off elsewhere. Unfortunately I haven't found any options for that yet.
Try modifying the data alert entries AttackUnit_Terr, AttackUnit_Prot and AttackUnit_Zerg. (terran, protoss and zerg unit being attacked)
I'm not sure exactly which values to change, so you'll have to experiment, but from the little I've tested with them, that's where it happens.
Edit: It's not this alert after all. This one only modifies the alert that happens when your units get attacked off screen.
Edit2: I found where it is now. It's under Gameplay UI Data -> Default SC2 UI Settings -> UI - Minimap + -> Color - Under Attack