Some of these newfangled inkjet prints on watercolor paper are very suseptable to moisture from hinges. It is important to learn just how long to wait from the time you paste up the hinge until you actually apply it to your artwork. This goes for ANY paper art, not just WC or photos. Do not practice on your art. Get some samples from the printer on the same paper and practice on those.
The easy way to find out how long to wait is to paste up 6-7 hinges all at once. Apply the first hinge to some flimsy paper (like a magazine page because they pucker like crazy when dampened) right away. Set an egg timer for 2 min. then apply the 2nd hinge, another 2 min, the next hinge, etc.
You should not press hard when doing the initial blot as you will force dampness right out of the hinge and into the art paper. Blot gently, apply a weight (about a tablespoon of bb's or shot in a babys sock is perfect) and wait about 15-20 minutes from when you applied the last hinge.
Now you will be able to see that the first 2-3 hinges puckered the art - the last ones were so dry that you didn't get a good bond. Test each hinge in "Shear" to test for bond strength.
It is important that hinges ONLY be used in "shear" as they are very weak in "peal". Shear is tape test talk. For example you stick some tape to the edge of the table top and pull straight out. Very strong because you're attempting to break the bond all at once. Peel is when you take that same tape and fold it bock over on itself and pull towards the center of the table. Very weak because you're breaking the bond a little at a time.
This is why you should not do "V" hinges because even if T'd they are still in the peel mode.
It is also very inportant to have loose "Safety hinges" at the bottom and maybe even along the sides. these will become the primary hinges when some idiot turns the frame sideways or up-side-down.
Rick