Having trouble with Preview - acts erratic.

Oct 29, 2013
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I am having problems with OSX's Preview. When resizing large amounts of pictures, the thumbnail list on the left jumps from top to bottom and vice versa. This is frustrating when trying to edit, delete or just pick the next picture in line. It also seems to only work on a minimal amount of pictures. I try to keep it below 150, but would like to load more if possible.

Does the same on my Mac Pro and Mac Book Pro. Plenty of ram on both. 32g &16g respectively.

Do I need to purchase a more powerful app, or is this an anomaly?

Running latest Yosemite on both.

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