There are currently issues running PowerPoint with the empower slides addin and the sli.do addin at the same time. The issue needs to be solved by slido who is already working on a solution.
We observe the scenario closely thats why we are in close contact with sli.do to make these two addins compatible.
At the moment there is a fast and easy way to work with slido when you have installed empower slides.
Just press the - key and search for "Activate empower slides" or "Deactivte empower slides" to set the right status of empower slides.