D810 web page display problems

I have a Latitude D810 with Radeon x600 and WSXGA LCD at 1680x1050.
Overall the display is beautiful with very crisp text and graphics on the Windows desktop and in Office and other applications.

However I have experienced several strange problems displaying web pages:
1. Graphics display distorted and pixelated with jagged edges.
2. Background graphics on some web pages fail to display. For example a white background is displayed instead of a tiled graphic background.
3. Text and buttons in Internet Explorer are displayed much larger than normal. Must select smallest text size in Internet Explorer to obtain a layout that looks even close to normal. Even then some webpage text and buttons (eg Google Search buttons) are still larger than normal.

I have tried the following:
Changed registry key useHR=1 to useHR=0. This fixed the fixed the first problem (jagged graphics) but the other problems remain.
Switched dpi settings from large 120dpi (as shipped) to normal 96dpi. Also tried custom sizes 110dpi and 150dpi. This changed size of desktop icons and text but Internet Explorer web display problems remain.
Updated video drivers with R104771.EXE.
Updated video BIOS with R101342.EXE.
Updated system BIOS with D810_A04.exe.
Reset Internet Explorer settings to default, cleared cache, cookies, etc.
Disabled Internet Explorer plug-ins and activex controls.
Ran full scan in Norton AV and Ad-Aware SE.
Re-installed Service Pack 2.

Again, the display problems seem limited to web browsing. The desktop and other applications appear normal. I also tried Firefox 1.5 and it displays text somewhat better but it too has the problem with background graphics.

I heard of the Dell Internet Explorer Scaling Utility but not tried it yet. Does it do anything other than change the useHR value?

Dell Gold was unable to provide an answer but suggested Dell On-Call support which I believe is $100/incident.

Any other ideas before I throw the D810 out the window?