I had a large assembly open and i was changing the appearance of parts in it.  after 30 or so it locked up and immediatley crashed.  after changing the color of each part i saved while the part was open.  i had not yet saved in assembly mode.  On reboot i opened the assembly to find that all my appearances reverted to default so i did a rebuild and ctrl+Q to no avail.  i opened an individual part to see if the color was corect and it wasnt, even though i saved before the crash.  Am i stuck repeating everything i did before the crash?  where did my changes go?