Java SE (Java Platform, Standard Edition)

http://alfryd.glwb.info/

That's the running applet (may take a while to load.) It all seems to be fine, except that there is some horrible species of flicker that crawls along the bottom edge of the viewing area in the browser. I can't imagine what's causing this, as I'm using direct BufferedImage raster access and the rendering thread has been timed so as to delay the next frame until rendering is complete. I also don't get this problem when I run the program as an application. Any notions of what might be causing this? I can show portions of the source code if requested, but's a couple thousand lines, so give me some idea of what you'd need to see first.