I have had Drupal COD running for about two years, but when I went in recently to try to add a ticket type to a conference, the conference refused to save. It just re-displayed the main conference form and the ticket I'd tried to add was gone. No error message. I've also tried editing the main body field of the conference and that doesn't get saved, either. I suspect it's related to ticket types because I created a new conference and was able to edit it and add ticket types until I got about three ticket types entered and then the problem showed up for the new conference, too.
I'm not 100% that this second issue is related, but I think there's a good chance of it. When I add a new Paid Event to the products list, then go back and edit a conference to add a new ticket, the new product doesn't show up in the select box. If I edit the conference content type and switch the widget to an autocomplete box, then I'm able to find my new product, but the conference still fails to save (as in the first paragraph). Strangely, when I switch the widget back to select box (or to radio/checkbox), the new product is gone again! I've tried drush cc all but that never fixes it.
I'm comfortable digging around in code and running mysql queries, but I haven't been able to decipher either to the point of finding the ticket types in the db and manually adding rows. Can anyone point me toward a solution to any of this? Thanks!