Just switched my home 4011 from 6.49.2 to 7.1 and noticed an issue with some of my routes when it finished upgrading.
Version number: 7.1 (stable)
Router's model: RB4011
Problem: If you have spaces in your interface name (eg: "PPPoE - ISP NAME [100/40M]") when entered as a gateway the route will be invalid and loose its defined gateway.
Click OK
Route becomes invalid, looks like this:
After renaming the interface to something like "pppoe-ispname" there is no issue and the route is accepted.