Thanks for that jonwormwood! Looks like SWS is the culprit, indeed... => you can just remove the extension until we fix/sort this out (i.e. remove reaper_sws.dylib from <REAPER_resources_dir>\UserPlugins) @Justin I see where the issue probably lies but I have no idea why this would clash with Mavricks (dunno it + a bit relucant to upgrade...). Do you have any clues/ideas to share for a fix? EDIT: moving this thread to the bug report section...