No issues using the older (pre Mavericks) driver with my 3880.
My 3880 totally crashed under Mavericks installed on my relatively recent model (summer 2012) MKbkpro. The new driver on the Epson Website that Sal mentioned fixed the problem. Seems like there really was a need for some Mac users for an updated 3880 driver when running Mavericks, and Epson has given it to us
Thanks, Sal, for the heads up on the Epson driver update.