Firstly apologies for the delay in response, i've been without access to my data for 8 weeks, so unable to respond or test anything, all i can say here is sorry for leaving you hanging..
I'd at least need to know what options you have set for the plugin, ie. the settings provided by the plugin, which you have enabled / disabled, etc..
Screenshots would be extremely helpful to.
@arni - Please see the FAQ on the plugin page, the shortcodes cannot go on the same line, they must be spaced out for the shortcodes to function correctly, this is not a plugin restriction but a shortcode one(not something i can fix).
@Graveyard - Rather than writing the code yourself, just have your template pull in a page/post that uses the shortcodes, that way you'll avoid the problem you're having.
@drperil - Preview only works when skins are enabled, beyond that i've not found any problems with preview, if you can give me a way to replicate the issue though i'll be more than happy to work on a fix.
RE: Tab start and stop in TinyMCE
That's a pretty good idea, i don't see why not, i'll consider making that an option in a future release. I don't like the idea of forcing features onto users, so if i can get it into the plugin it will be as an optional feature.
Please though guys, if you want me to work on fixing a bug i need you to ideally provide steps for me to reproduce the problem you're having, even if it's something as simple as having me create a post with specific content or loading a page with a specific browser. I test the code locally, and i also upload it to a remote testing site to ensure it works there to, i can't really do any more than that without your input on how to reproduce the issues you describe.
EDIT: No further input from the original poster(s), marking resolved. Feel free to start a new thread if you need further help.