Fix checkpoint upgrade script
Printing callback.__name__ to console while doing callconditional
Disable ds comparison in RefreshItems
Disable internal player on os x
Merge pull request #386 from NielsZeilemaker/callback_name

Printing callback.__name__ to console while doing callconditional
Do not block on event logger
Merge pull request #387 from egbertbouman/fixes63

Fixes for the 6.3 release