Re: Upgrading from Marlin 1.0.0 to 1.1.0 RC3 causes X/Y skipped steps

Are you using one of the BOARD_RAMPS_14_??? defines? Using the RAMPS_13 can have problems with a RAMPS 1.4. That's one of the changes between 1.0.0 and 1.1.0 RC3.