Blank White space instead of ComodoAV screen.

Trying one more time to solve the problem I outlined in a previous question;

Hope this is not a repeat -

My system is XP-pro SP2 and up to date.

I recently installed Beta2 - which works on a similar machine in the house. When I right click the tray icon (or try from the start menu) on “show Comodo AntiVirus” all I get is a blank white space on my screen. I can close it with task manager but would like to set it up my way and schedule scans.

CAV seems to be updating and protecting but I wold like to know that it is.

Any suggestions please?

All help appreciated