Thank you!
I had problems updating to Moodle 1.8 because we had some 3rd party packages in 1.7. The way I got around it is that I installed Moodle 1.8 with an empty DB, installed the 3rd party packages and then switched the database to the production one. Nobody used the SCORM in the production DB, but it could be that some third party packages did and this could be be the reason for the problem. I'll have to investigate more.