Expert screen refreshing.

 
Hi Slawa,
I have strange problem.
For long time I was developing an indicator and everything was functioning a OK
Now, I have added an Expert to that indicator and having problem with screen refreshing.
With every tick I am loosing some horizontal Object Lines. and some trend lines too as soon as the first order opens.
I can see them momentarily during a tick.
I do not know if that is when expert or indicator is displaying.
What am I doing wrong?

I am running 4/191 8, March 2006