I've found a bug that RailClone version 2.7.0 causes on 3DS Max 2017.
It creates an empty category with empty items on Customize User Interface, as you can on the attached images.
I could identify that the cause is the file "railclonepro.dlo". Once it's removed from the plugins folder, it all goes back to normal. If I put it back, the problem returns.
I hope this problem could be solved.
Keep up the great work.