I just want to share something I found when migrating from Joomla 1.5 to Jommla 2.5:

Upgraded with jupgrade, migrated from joomfish to falang, then installed ARTIO Booking new, uploaded my saved tables and everithing was fine except no objects for booking was showen, even if they were in database.
After hours of struggeling I fount, that there was in db-field "access" a "0" - I changed manually to "1" and everithing was fine.