I also get the crashes but now I have worked out when I am about to crash. Its kinda hard to explain until you see it. I get these white flashing boxes appearing around the mobs then sure enough shortly after this the whole client will just close down back to the desktop. As soon as I see these boxes I will load up another client ready to log back in. I've tried to take screenshots but the flashes are so fast its hard to capture. I will try video next time.
As for the desync the only way I could find to reproduce this would be to have hiding on a character. Run about, stop, hide and 90% of the time it will hide, then jump a square and of course un-hide the character.
The ghost mobs are also very very annoying. I get these for monsters and also players. Its annoying as I have "target nearest" set for my main attack macro and if there is a ghost mob it just locks onto this even though there is nothing there.