xarBB/roles/dynamic_data properties when using database backups

I recently installed a fresh copy of Xaraya 0.906, and replaced some of 
the mysql tables with the ones i had backed up from previous versions. 
In doing so I apparently lost 2 properties in dynamic data > roles.  If 
you have a problem with xarbb not working correctly after using a mysql 
backup, in this case something similar to:

Fatal error: Call to a member function on a non-object in 
/home2/dem0dave/www/var/cache/templates/340af2d2b00621d2d038a6db65ccd257.php 
on line 106

Then you need to go to DynamicData > View Objects > Roles (edit) > 
Modify Dymanic Data Properties and add avatar and signature.

Both should have property type - Image, data source type - dynamic_data, 
and  status type - display only.

I assummed because there weren't any db changes between 0.905 and 0.906 
there wouldnt be a problem, especially since I upgraded to 0.906 before 
my backup.  I've spoken to a few people that did similar things with 
their db and had no problems, so I don't think it's a bug.  It was 
probably something I did or didn't do, but just in case this is just to 
document how to fix it.