Thank you for choosing Autodesk Support and we really apologize for the delay.
Did you tried to use the export Autodesk Architecture 2012 Settings option from the machine where these toolpalettes were created ? (Start > All Programs > Autodesk > AutoCAD Architecture 2012 > Migrate Custom Settings > Export AutoCAD Architecture 2012 Settings). Normally the Zip file created should not include the xpg files as explained into the link below:
Then if you are still in same situation, I recommend to check if restrictions or any rules could interrupt sharing files. Then you can also try in between a reparation of the product, in case there was something wrong with the toolpalette functionalities.
We can check this together through a remote session eventually if you have 15 minutes free, to understand better interaction between the catalog and the palettes you want to share and implement.
In addition here below additional threads on that topic :