i have been having this same issue for several months now. I have used the program with no problems for years. Now, playback contains pops and often speeds up. This results in really poor recordings. I am using Windows 10 and Sound Tap 2.31. I have tried downloading the free version onto a notebook and get the same results.
Original source does not contain these issues. I'm not a "techie" and need help on this one. I used to love the results I got from Sound Tap.