I also seem to be having problems with this plugin.
Once enabled, here's what happens:
Attachment 136221
The error only appears for users who are in usergroups with custom styling added.
Here's the code I have added for the Admin usergroup:
Before:
Code:
<span style="font-weight: bold; color: #0000CC;">
After:
I have disabled it for the time being, but I'd appreciate it if anyone has a fix?