Strange. There's a few things you could try. I can't experiment because the UK hasn't had the June update yet.
The things are advisable after a major update and will speed up the device. 1. Clear your system cache. There are tutorials in here if your not familiar with it. After you've done the key press thing it takes you to the recovery menu. From there you can clear system cache. While in recovery also select Repair Apps and see how you get along.
Thanks for the reply. I'm an Android developer so I've tried all the standard stuff. I'll wait to see if others have the same experience once they get the update. The raw photo displays ok in other gallery apps. Cheers.