Thanks for the response.
SQL done, with the below errors, however the extremely slow/partial loading problem persists, seemingly unchanged.
I'm running my old roundcube and upgraded roundcube side-by-side on the same database and the old version runs normally on the 'upgraded' DB with no issues.
SQL/mysql/2011092800.sql
SQL query:
ALTER TABLE `users` CHANGE `alias` `alias` VARCHAR( 128 ) BINARY NOT NULL ;
MySQL said: Documentation
#1054 - Unknown column 'alias' in 'users'
2011121400.sql
ALTER TABLE `contacts` DROP INDEX `user_contacts_index` ;
MySQL said: Documentation
#1091 - Can't DROP 'user_contacts_index'; check that column/key exists
SQL/mysql/2012080700.sql
ALTER TABLE `cache` DROP COLUMN `cache_id` ;
MySQL said: Documentation
#1091 - Can't DROP 'cache_id'; check that column/key exists