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It doesn't always happen, but when I home my printer sometimes it will make this loud slamming noise. I only noticed it after installing .92 repetier. I'm sure if I were to switch back it would be fine. Its like something is bumping the carriages/effector when it moves into the extruder offset position and moving them all <1mm down. This makes things very frustrating, I've had to restart the same print several times just to get a good first layer.

I did notice if I lightly held my hand against the effector it wouldn't make the noise and it wouldn't move down. One of the times I did this (at the beginning of a print) I, while applying very little pressure, was able to push the whole carriage assembly towards the Y tower. This was completely accidental, and was caused by me just trying to keep very light pressure on the effector to prevent the issue. I'm wondering if there is a bug that causes the stepper drivers to limit (or even cut out) the amount of current going to the steppers directly after a G28 command? Or maybe its simple as my stepper drivers are broken? I have some new fancy ones coming in from Panucatt so that second option will be tested out sometime soon.

Does anyone know what could be causing this?

I've been running 0.92 for a while now, and while I see other issues I see nothing like what you see. I don't have any extruder offset so it's possible that the offsetting move has too high acceleration/velocity?

That is also a possibility. Not sure why it would show up on a firmware change, the settings are (or should be) the exact same thanks to EEPROM. I was at around 8 days worth of printing, and it'd probably been homed over 100 times with all that calibration, I'm sure it would have reared its head if it wasn't related to .92?