Ever since the color palette update I think there's a glitch that makes saving take a really long time, and you may have done something to halt the saving process, i.e. joined a match, quit the game. That happened to me once, but it fixed itself for me, at least.
Last night I was playing against someone with an ALL BLACK G1 Optimus. That isn't in the color palette. I wish I had taken a picture, but too much green energon at the time.