Created attachment 54460 [details]
See the border of the not-shown rightclick menu.

Version:           0.6.1 (using KDE 4.5.4) 
OS:                Linux

I've tried to copy a string from the browser, but I couldn't see the right-click menu. It's not always happens, after several try I'd been able to see it.

First happend: Kubuntu 10.10; KDE 4.5.1
After upgrading from Kubuntu-PPA it won't get better.

Also noticed with the general menu (on the left of the URL bar), but not so often.

If moving over the cursor, the submenus will appear correctly.

I tought it's a bug in Qt, but no other applications do the same.

Reproducible: Sometimes

Steps to Reproduce:
Open a website, try click with the right button of the mouse.

Actual Results:  
Sometimes it's working correctly, sometimes won't show (just borders of the menu, and submenus)

Expected Results:  
Should see *always* the menus.