Having the same problem when connecting to SharePoints links such as \\xxxxx.sharepoint.com@SSL\teams\ProjectX\Shared Documents (The network path was not found.)
- trying to access trough the Favorites Folder menu fails on first click (The network path was not found.), but selecting it a 2nd time right after does work
- trying to access trough the Favorites Folder Icon in the toolbar below the menu fails on first click (The network path was not found.), but selecting it a 2nd time right after does work
- trying to access through the normal folder tree does work
- trying to access through a catalog automatically built from the favorite folders fails on first click (The network path was not found.), but clicking on it a 2nd time right after does work
- copying the links in the address bar and hitting returns fails (The network path was not found.), hitting return a second time does works
So there is a workaround: either normal tree or selecting twice