Hi Carl, thanks for your responses. I've tested your new codepen, and the issue is still there. The behavior is the same whether in the /codepen iframe or busted out in /debug. Are you not able to see the issue in IE? I've tested in IE10, 11, and Edge, and the bug is there in all three.
I've not made any modifications to the plugin file I downloaded. I simply extracted it directly from the ZIP archive ("GreenSock-BusinessGreen-js.zip\GreenSock-BusinessGreen-js\src\minified\plugins - ZIP archive, unpacked size 1,348,076 bytes") to the directory I use. The file is minified, of course, but that was done on GreenSock's end.
What I find odd is that the version for exclusive codepen use (//s3-us-west-2.amazonaws.com/s.cdpn.io/16327/DrawSVGPlugin.js?r=5) works beautifully, but the downloaded one, despite having the same version number, does not. Comparing the two, I see a difference where the code validates for codepen usage and redirects if not, naturally, but I also see other differences throughout the code. Clearly, despite the identical version number, these are not both version 0.0.6, and I think therein lies the problem.
Thanks.