What steps will reproduce the problem? Load the regions into a playlist. Start playing a project and click on another region in the playlist. What is the expected output? What do you see instead? I expect REAPER to start playing the selected region. Instead, I see the warning message in the attached file.
What version of SWS extension are you using? (Extensions -> About SWS...)
2.4.0, build #2. What is your Reaper version number and CPU architecture (e.g. Reaper 3.75 x64)? 4.58pre1/x64 What operating system are you running? (e.g. Windows XP/7, OSX 10.5.8 etc, 64bit?) Windows 7 64 bit.