maxscript stops showing results until trackbar is moved.

Hello everyone.

I have this problem and I really don't know why this is happening.

When I use maxscript, and start scripting a position controller using position_script, somehow, at random time it stops working.

Normally when I move the one object, the second object that is scripted and is referenced to the first one moves to - simply reacts to the script.

And then - after some time (random, usually more than 30 min) I can only see the changes when I move the trackbar slider, or when I press "evaluate" in controller script. I can't point out the cause of this.

I tried changing some options in viewports and maxscript preferences - no results.
Resetting 3dsmax or restarting it doesn't help. I am using 3ds max 2008 x64. win xp x64.

Only restarting the windows helps, but this is absurd.

Any one know the solution?

Best regards,