X homes but then doesnt move

[printbus]

Have you already uncommented the DISABLE_MAX_ENDSTOPS in your configuration.h? If not, it could be that the X max endstop input is floating upwards enough to be detected as X being at the max endstop. It seems to me that the effect of that would be homing until the min endstop switch closes, but the carriage won't move away from that (possibly for either the homing tap or a manual move) since Marlin thinks it's already at max X.

If that happens to be it, credit clough42. He pointed out the DISABLE_MAX_ENDSTOPS issue with Marlin defaults a few weeks ago.