I use Unity with restored systray from timekiller repository. I had no problems with it until there was an update in proposed repository. I realized my mistake and downgraded it because it was really slow on my workstation.
Since this time I have been suffering from problem described in topic. In addition, when systray disappears, Dash starts being slow like proposed version was. I tried to disable detection of screen refresh rate and all other hints I found (see how to increase Unity performance), but this helps neither to increase it's speed nor to solve the main problem.
The only workaround I have is to run
unity --replace &. Then systray appears again and everything is fine until it disappears.
So, how can I solve this problem?