I have a mostly working implementation of DCU4 on the M4 side of our Vybrid processor using D4D. However I'm seeing some pixel data being lost. I'm confident it is not a timing issue with the LCD as the Color bars display correctly with the DCU4 in Mode 0. It looks as if some of the data is being lost or not correctly placed in the framebuffer by the D4D low level code. Any ideas or advice would be welcome.