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i detected, that reindeer/styles.css contains a lot of "-background-image" properties for ie6. And it seems that the leading "-" causes some troubles running google chrome on OSX. I am using the ComboBox very heavily and if more than 3 browser tabs are opened in my application, suddenly the background-image from ComboBox disappears.
If i am using the developer tools and remove the property from the browser after the bug happens, everything is fine again. But i could not reproduce the bug using the vaadin sampler. Everything seems to be fine there!