Debugger with blank screen

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Hi!

I have an odd problem with NAV Debugger. It was working just fine but on one day I noticed that it's not displaying output any more. If I'm running debugging then Debugger opens and it shows also active objects on title screen but whole screen is blank without any toolbox like (Output, Call stack, Variables, Watch). If I'm continuing debugging then I can see that it's working (active object changes on title screen) but I can't see any information on the screen. If I'm disabling all four toolboxes (Output, Call stack, Variables, Watch) then the screen starts showing code part and I can debug but I cannot use these four toolboxes (if I'm enabling even one of them screen stops showing debugging code. I tried to figure out what could cause this but didn't find any reason. I don't have Citrix client also I don't have any virus software installed and I turned off Windows firewall. Problem stays the same. Could anyone have solution for this problem?

Thanks in advance,
Anti