Did you set the AUTOUPDATE field to "N" for each record you updated?
And note, as already stated, I'm aware of some problems with how photos work, I've submitted request to AirNav to change how this works, it's been approved, so will hopefully be in the next beta. The intention with the proposed changes is that photos will be displayed according the following rules:
1. If PTTN has a value in it, use that thumbnail file name. Ditto for PTTN2.
2. Otherwise, use the old style file name - eg, for G-EZYA, file names G-EZYA.jpg & G-EZYA,2.jpg
3. Otherwise, NO PHOTO. However, if displaying in MyLog screen, search photo folder for any photo file with a name that starts with the aircraft registration.
We're trying to cover all eventualities here, with users having saved their own photos over the years, and some aircraft sharing the same registration, etc................