I recently went to Marsa Alam (with Emperor), and had 3 bouts of problems with the guides taking (or trying to take) photos with my flash...
1 Taking photos of 2 turtles, the guide put his hand in front of me and told me to stop using my flash
2 Being told on the boat, just before we got in, (on Elphinstone) we were asked not to use our flashes on the oceanic white tip
3 I put my name down twice for abu dabab to see the dugong and I was not on the list when it came up, guessing they were trying to stop photographers with big flashes and wide angle lenses to "scare" the dugong off
Any other similar experiences, either here or anywhere else in the world it would be good to get a list together (I also hear Malapascua dont let you with "their " Thresher shark)
Cheers
Woody