Issues With HD 7750?

Has anyone had issues with the Sapphire HD 7750 ultimate?Since installing a week ago I am getting small malfunctions with this card. These are

1. Occasional jumping / glitching of web pages inside IE9. A very fast twitching effect of the whole page.

2. On one occasion, a web page only refreshed to half way down so I could only see the top half of it. Re-starting the tab cured it.

3. When viewing a photo, if I alternate between full screen and a smaller size, the control bar at the bottom of photo viewer becomes corrupted with the buttons often disappearing. If I wait 30 seconds then snap to full again the problem normally fixes.

4. Yesterday about 6 or 8 red blocks appeared, around the bottom task bar. Each was about the size of a task bar icon, they would not disappear until I unlocked the task bar and moved it around a bit.

My install process was as follows:Shut down and remove old card (HD 4350).Install HD 7750.Reboot.Install Catalyst 12.3 driver set from the CD which came with the card.Check for updates to catalyst, download 12.4 and install that version.Perhaps I should have uninstalled the previous drivers for the old card first. I had assumed it would be OK with both cards being AMD.I do not believe there is any issue with temperature, the issues are present even at a cold startup and my GPU temperature has never been above 48 deg, is is normally around 40 in general use.I am tempted to RMA now unless someone else has seen this and can say it is drivers?