I don't have a problem with photos. I like looking at them. It reminds me of the good times the people I have lost had and the good times I had with them, but memories.... I think the mind is a funny thing and sometimes we block out even good memories when on some level, the mind knows how much they will hurt us, so I don't think we should punish ourselves by trying to force memories to come to the surface. Perhaps certain memories we are just not ready to recall because they would be too much for us, much like looking at photos can be too much for others. It doesn't mean they are not there or that we don't value those memories; in fact, I think it probably means the opposite and that, on some self-preservation level, the mind knows we just can't cope with those memories, so shields us from them. Perhaps one day, we will be able to bring them out and look at them again, like old photos that are too painful to see at the moment.