Just posting this in case anyone else is having the same issues and can offer assistance. Since taking the Studio One 5.3 update I have encountered multiple issues: (1) sound libraries not loading and locking up S1 completely (libraries that aren't new and never did this in 5.2), (2) tracks that suddenly don't play back during a working session that played even seconds prior...only fix is to close the song and reload the song (then it works again), (3) sound libraries taking FOREVER to load that previously loaded quickly.

Specs if it helps:
Windows 10, version 20H2
Studio One version 5.3.0.65413
PC Hardware - Intel i9 with 64GB RAM...horsepower was never an issue before this update.

Thank you!