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Delete project files. Start IDE. Change L&F to Windows. IOException is thrown:. java.io.IOException at sun.awt.image.GifImageDecoder.readHeader(GifImageDecoder.java:303) at sun.awt.image.GifImageDecoder.produceImage(GifImageDecoder.java:130) at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:248) at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:221) at sun.awt.image.ImageFetcher.run(ImageFetcher.java:189) There is no exception after repeating the action second time (back to Metal and Windows again).