[Qt-interest] Is it a BUG for Qt(4.4.3) that the keyboard sometimes can't work for some widget?

[Kermit Mei]

Hello, I'm using Qt 4.4.3. When I use designer, I found that my keyboard 
sometimes
can't input anthing(include backspace and Esc etc.) for some widget, or 
can't input
in the Property Editor, I must restart designer or change another widget 
and then
come back.

And now, In my own Qt Programming, I can't input some widget sometimes, 
and I must
close my program and restart it, then I "may" use keyboard in that widget.

I found it many times, and I don't know how to solve it.
Hope your help.
Thanks;p


Kermit Mei