Newest Update has Broken Playback on Older Score Sheets

It's as the title says, the version 2.3 update which released in May caused my older score sheets to no longer be able to play back the music properly. It instead started playing at a very high pitch and a much faster tempo. Then after tweaking with the audio output settings it started playing in a low pitch at a slower tempo. Could you tell me how to remedy this issue please?