Alright, try figuring out a pattern that can cause the glitch
on your machine. That way, you can test future version for the glitch, even if other people cannot reproduce it.
Try a fresh "reinstall" - the nightly build plus the original data files, no mods/modifications at all.
If OXC is the only application that is causing this glitch on you OS, it could indicate an incompatibility of the sound system with your hardware/software. It would have been helpful if you could dual-boot your machine, just to be sure.
This might be a long shot: can you handle your way about a Ubuntu live CD? You can even install/uninstall it as a secondary OS on your machine directly from Widows - no repartitioning needed.
Otherwise, you might want to try a virtual machine from here:
https://www.modern.ie/en-us/virtualization-tools (free, courtesy of Microsoft). I recommend VirtualBox, but Virtual PC might do fine too. You should get the XP virtual machine, it's cheaper on download size, setup time and resources.
If you can either dual-boot or use a virtual machine, try playing the game with an alternative/clean OS, to see if the problem still persists.