Chuck the issue that i had was that no thumbnails were showing. I tought the change in owner/group and non-showing thumbnails was somehow related, but they're not.
Strange since yesterday i tried to view it in three different browsers and all exhibited the same behaviour.
Today i looked at my gallery again from a different location (at work) and there everything was OK.
And now this evening when i got home and opened up a browser again everything is OK too.
Guess it was cache related.
Anyway thanks for your help on this ... you can consider this case closed
