Hi Mike,
It seems it for some reason is struggling to keep up. So it will skip frames to try to keep in sync – but apparently it doesn’t succeed.
Would you mind uploading your .ap file somewhere and email me the link so I can investigate what is happening? Or you can we-transfer it to me. My email is the one you got your activation key from.
Also, what is your computer specs? OS, memory, CPU, etc?
Thanks,
Niels