Highlight in selecting objects

Version 10.6.7 is really impressive, allow me to start with this statement.

There is however a display issue that's quite annoying to me: As soon as I select an object, it simply disappears to leave only the grips. As soon as I start moving / copying / whatever, it becomes visible again.

I did change the variable "GLSWAPMODE" to 2, the only option that works anyway.

Any suggestions?