Ghost note entry

Uploaded 4.5. Have same issue as with 4.4. A "ghost note" sounds and is entered on the staff of my score about every 7 seconds. The note is entered on staff lines way below the standard staff (about 10-15 lines). If I enter a note (using the pen method), the ghost note will sound and move my newly, manually entered note down to the level (pitch) of the other ghost notes. I cannot turn this off or stop it from occurring.
In version 4.4, I could copy and paste a note to prevent the ghost from occurring, but in 4.5, the ghost note starts upon opening the app and will not stop. It has rendered Musescore unusable.
Please help, I am totally out of business like this.