DivX 5.0.3 has now been released, here's some of the change log;
Fixed a bug where the last P frame before an I frame was not displayed when Smooth Playback was selected.
Fixed a practically unnoticeable YUV->RGB16 color conversion rounding bug.
Fixed a bug that was the cause of some of VirtualDub's "Cannot Start Video Compression" errors.
Fixed a few issues with DivX 3.11 compatibility.