Update!
I went about a different method for changing the page width. I clicked on “Customize” in the WordPress dashboard, rather than clicking on “Raindrops Options”. I saw that there are the same settings in this menu and using them does not produce the error. It is only when going directly to the “Raindrops Options” from the WordPress dashboard that the error is produced.
I will hope that this bug report will help in resolving the issue and allow others with this error to get their site working until the bug is fixed. 🙂
