I too have had this problem several times in images at work in the last 
few months.  It starts suddenly with no warning and never goes away. 
I'll try that method and see if it helps when I get into work.

Julian

C. David Shaffer wrote:
> I have this problem periodically (exaserbated when I try to drag a
> class from a normal browser to StarBrowser).  I've found that the
> world often has some bogus steppers in it and that:
> 
> Utilities cleanseOtherworldlySteppers (or maybe
> cleanseOtherWorldlySteppers?)
> 
> fixes it.  Thanks to the folks on IRC for pointing out this fix, BTW.
> 
> David Shaffer
> 
> 
> ar writes:
>  > I'm having a problem with my 3.6g linux image where button clicks eg to
>  > close a window, or to open a debugger from the walkback window, are not
>  > processed until I move the mouse.
>  > 
>  > This only happens in one of my images. I dont know of anything that
>  > happened in this image that could account for this particular trauma. I
>  > dont go near the UI code and I never save the image with state changes in
>  > it ( on startup, I replay my recent changes from previous session, then
>  > save)
>  > 
>  > As far as packages the the only "interesting" one loaded that I can think
>  > of is worlds of squeak removal(2).
>  > 
>  > Anyone come across this problem?
>  > 
>  > 
>