I cannot reproduce such issues with OS 8.7.10 just hitting the up and down buttons of the RIG navigation cross of a Head model nor the up and down foot buttons of a Remote or Stage. If I hold a bit longer, scrolling starts as intended. If Rig Manager is connected or not makes no difference. I can even hit a button multiple times (hearing multiple mechanical clicks of the button) and the PROFILER follows steping up or down the corresponding number of Performances.
If you cannot control single steps versus scrolling with the current OS, please open a support ticket and send a video demonstrating how you hit the button and how the Performance gets loaded.
Dear Burkhard. Lucky you. I was on holidays and made a video today. It still appears randomly. I will sent the video to you. I am on the latest OS.