Warning screen pops up for less than a second then disappears

After I upgraded to Mountain Lion, occasionally a warning screen with the yellow '!' pops up for less than a second then goes away. What does trhis mean, does anyone else have this problem?

Never seen it - never heard of it. Does it popup while you're using any particular application? Is it like a dialog box? It could be some third-party application trying to warn you... about something.
Clinton

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