The Haymarket tramworks have lead to the temporary closure of the Russell Road exit at the end of the route. As well as the tramworks, it looks as though the exit from the route to the road (which then leads to an ideal cycle route up to the canal and Bruntsfield, as well as Dalry) is also being upgraded with pedestrian and cycle facilities.
In the meantime, follow the yellow diversion signs from the path all the way back to Russell Road. The diversion is for cyclists and pedestrians only, and is clearly marked the whole way. The alternative route starts at West Coates Terrace.