Really strange graphic anomally when zoomed in

Ok, have any of you seen this? It seems to happen with recent RAW files when I zoom in to them.

When I'm zoom at Fit, things look normal.

http://farm9.staticflickr.com/8471/8139450824_52be848aac_c.jpg

But when I zoom in at any level, it looks ok for a second.

http://farm9.staticflickr.com/8331/8139450776_188c51926c_c.jpg

Then it does this. And it does this to a lot of the files that I've recently shot, but not so much the old ones.

http://farm9.staticflickr.com/8051/8139420057_6de7fb6efd_c.jpg

http://farm9.staticflickr.com/8332/8139420223_49442dced4_c.jpg

I updated my graphic card for the ATI Radeon Mobili HD 5650 on my Acer Aspire 4820TG running Win 7 Pro.

I tried using GL on Auto and Never, but still experiencing the same problem on a lot of RAWs, but not all.

I do have C1 Pro 6.4 installed on a separate folder, since I'm doing a review on the difference between the two versions.

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