I'm surprised there is a homing retract distance - I always assumed it reversed until the switch went back the other way.
This is a good find. There are 2 or 3 people out there with this problem. I think including NicoLinux. I'll message him right away.
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Just a note that, going back through the history of Z_RETRACT_MM, it was originally 1 mm, way back when this config option was first created for some other printer (RepRap?), in https://github.com/stevegt/Ultimaker2Marlin/commit/a0dc66f7bfab6815c4a64a1fbf02dd82d1d75d11.
Daid increased this once, from 1 mm to 3 mm, to stop the bed from aggressively slamming against the limit switch: https://github.com/stevegt/Ultimaker2Marlin/commit/a8e7333937cfc52e518d8e6d913d0d8111277777
So it looks like we're on the right track, and increasing this again to 5 mm is likely just continuing the process of tuning it for the UM2.
I don't know that 5 mm is the "right" number either, so am open to suggestions. It does work for me. If anyone else wants to try this, the Makefile included in my patch branch should let you cleanly build against the Arduino 1.0.1 libraries. For more information about that, see http://umforum.ultimaker.com/index.php?/topic/5933-building-marlin-makefile-updates-for-um2-and-arduino-101/?p=54260.
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