Posting this here as well:
I'm using Justins SWS build on Windows 10 with Reaper 5.981 dev0814 and there's a problem with "SWS/BR actions that play from mouse cursor position and solo track under mouse for the duration".
Executing it once will work flawlessly, but having done that, the GUI goes nuts (artefacts and Reaper becomes unusable). Executing it a second time creates a time selection and solo does not work anymore. Also, the "play cursor" disappears.
Have a look at the GIF:
https://nextcloud.stephanroemer.net/...2AqSDQcYgwT4Yo
Bug report on GitHub:
https://github.com/reaper-oss/sws/issues/1180