This one worked for me 100% after trying a bunch of other things:
Go to Tools -> Options -> Environment -> Keyboard -> Press the (RESET) button
Go to ReSharper - > Options -> Keyboard & Menus -> Select the "Visual Studio" scheme -> Press "Apply Scheme"
Press "Save"
Press "CTRL-T". Since this shortcut is mapped in both VS and Resharper, you will be presented with the "Shortcut Conflict"-window. Here you select "Use ReSharper (Ultimate) command" and make sure to check the box "Apply to all ReSharper (Ultimate) shortscuts".