Currently Being ModeratedAug 16, 2013 3:43 PM (in response to Ice Cool)
Run "Repair". Details on the Apple Aperture Trouble-shooting page. Be sure to let the repair finish.
You should repair your Library before every upgrade. (Not saying you didn't .)
Currently Being ModeratedAug 16, 2013 4:14 PM (in response to Kirby Krieger)
Done this still no difference
Currently Being ModeratedAug 16, 2013 4:35 PM (in response to Ice Cool)
What does Aperture's Activity window show? (From the main menu bar: Window > Show Activity)
Is Aperture still busy with upgrade tasks running in the background?
When you followed Kirby's suggestion - did you only run "Repair LIbrary" or also "Repair Permissions"? I'd do that as well.
And i'dtest with a new, small library with only a few test images to see if the library is to blame.