Bug in rendering engine (on any site)

Bug in rendering engine (on any site)

I'm using winamp as my default music-player. In it I have enabled the "always on top"-option, so that it is drawn on top (in the foreground) of any other window/program all the time. This worked fine as long as I can remember.

Now with version 10.51 of Opera this isn't the case anymore: While scrolling a page Operas new rendering engine seems to shift just the visible part of web content since the area where the winamp program was shown before scrolling is not filled with the appropriate content. I'm no native English speaker so just look at the picture I have attached to this post to see what I'm trying to say:

Opera 10.51 RenderError.png

- Area 1 shows you the initial state before any scrolling.
- Area 2 is the result when pressing the 'down'-key twice. You can see that Opera has no information on the content which should be 'under' winamps window.
- After I pressed the 'down'-key twice I pressed the mouse-wheel so that the page scrolled down smoothly. The result is visible in area 3.

I have encountered this bug on Windows XP (32 bit) and Windows 7 (64 bit). I have a nvidia graphics card with the newest drivers installed. It also appears on my netbook (Asus Eee PC 1000H, WinXP 32). Since I jumped directly from 9.64 to 10.51 I cannot tell if this error occurred on 10.5 and earlier 10.X...

Sadly, 10.51 has many more glitches but this one is the most annoying and obvious for me. Please, Opera team, have a look at this issue.

Thanks in advance!