Question: I need an input mechanism to allow a user to create a single-level bullet list. I can't trust the user's ability to know HTML formatting or to not mess it up if auto-formated. I've been debating using a wysiwyg editor, but that doesn't force a bullet list.

I have jQuery installed, but can use other options.

Answer: 
I had the same problem while running Rstudio 0.97.237 and R 2.15.2. The issue had something to do with JAGS. 

The fix: Update to JAGS 3-3 by downloading and installing it from [here](http://sourceforge.net/projects/mcmc-jags/files/).
I encountered the error: unable to load shared object '/Library/Frameworks/R.framework/Resources/modules//R\_X11.so': on my Mac and DuckDuckGo led me to this post. I was using R from the command line, so I can't speak to how it works with RStudio although I'm pretty sure it's the fix for that too. I updated JAGS from [the SourceForge link](http://sourceforge.net/projects/mcmc-jags/files/) provided in another answer. I can at least verify that it worked for me, though the developer was unsigned (I needed to ignore a MacOS warning during the installation procedure).