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I have been experiencing problems with icons in the dock. When I open an application that is not in the dock (e.g. from the finder), a transparent square appears. Same thing happens in the application switcher (i.e. command + tab).

Image

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Is the problem with specific applications, or all of them? –  Hasaan Chop May 11 '10 at 0:51
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Are you using a Macbook/ Macbook pro? I had this problem once before. As each time I simply closed the lid, a simple restart solved the problems. I find if you're using a Macbook pro you should probably restart it after uptime of approx 20-25 days.

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Thanks a lot! restart worked just fine –  Alex B. May 11 '10 at 0:55
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