If this happens to multiple games (or even all) in a similar way chances are that you have something installed on your PC that conflicts with vorpX. Many programs hook into games similarly to vorpX, not all of them are obvious.
This can for example be a graphics driver add-on, a virus scanner, a chat program or anything else that can display notifications in games.
The trouble shooting guide in the vorpX help lists a few things that are worth looking into in this regard.