I just did an upgrade from 1.2 to 1.2.3 and I've run into a "Fatal error: Exception thrown without a stack frame in Unknown on line 0" when I try to visit the front page of my site after logging in as an admin. During the upgrade process I received a warning that my db wasn't utf8. I fixed the database by dumping the tables, converting to utf8 encoding, creating a new table (utf8 default) and importing the cleaned up tables.  Seemed to work, but when I try to visit the homepage I get the above error. I deleted my dwoo and smarty caches as well as the sessions directory (hope that wasn't a bad idea!) but still no luck. I can visit the homepage if I log out. When I revisit the admin/upgrade.php page I see the following error - 

Portfolio: Site Unavailable

A column of your database is using a collation that is not the same as the database default. Please ensure all columns use the same collation as the database.

 

Any help you might suggest?