Tool palette tools do not hold content, they hold pointers to content and some instructions for how to insert that content. Is the source file that held the content for your room and door tags in 2006 still available, and accessible to users when running 2008, or was that file deleted or moved when you upgraded to 2008?
If you have the 2006 source file and still need it for use by some still running 2006, I would suggest that at the very least you make a copy of the file, open the file in 2008 and save it, then recreate the tools. As Leo mentioned, make certain that the Property Set Definition(s) referenced by the tags are present in the source file, so that it(they) can be copied to the target file where you are doing the tagging, if it(they) does(do) not exist in the target file.
In 2008, you may also want to consider making the view block(s) behind the tag annotative, so that the tag becomes annotative.
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David Koch
Autodesk Discussion Group Facilitator
Using ADT 2004 at work; access to 2005, 2006, 2007 & 2008 at home