Desktop Support wrote:
We did not find any problems with this. The ticks are shown on the platform.
Could you enable the java console and post the problem output here?
to enable the console, please close the platform, set
Start -> Settings -> Control Panel -> Java -> Advanced -> Java console -> Show console
and restart. Next time the problem appears, please look if there is any output in the console and post here if there is.
I've tried to lauch platform on another computer and the problem has gone. Sorry for the trouble.