Thanks guys for your help.
Danny I followed your instructions and all is now okay.
Michael, this is what I was doing when the problem occurred.
I drew two concentric circles(was going to create a tube), selected both then tried to extrude them. Nothing happened and I tried again. Same thing.
I think that's when I noticed the top and left windows were blank.
As you suggested I tried to repeat these actions but everything worked as it should.
Will let you know if it happens again.
Thanks again.
Cheers
Mal
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