I've been spending quite a bit of time tweaking my Magento e-commerce site and while asking a question, I noticed I couldn't use the [magento-admin] tag. I add it but then it fades out. The magento-admin email subscription is quite useful, as is the tag.
Edit: Here is an example: Magento Adminhtml override module not working I just edited it to add the [magento-admin] tag. It appeared in the pop-up below the tagbox. I click it, it adds to the list in the tagbox. I click save. Not there on the question afterwards. Also, in this case, [magento-admin] is different from [adminhtml], which implies custom module code for use in the back end.
Why does it do that? Is there a place on SE where I can read how tags work?