What's Up and IPhoto do not longer communicate in my Iphone 6

1.- When trying to send a photo, the What's Up icon do not show among the options to do so. Only messages, mail, twitter, Facebook, flick do show up. In "...more" when a long list of other applications show, the What's Up icon doesn't show. In the past with my Iphone 5 I used to send photos through Whta's up with no problem at all.

2.- When in What's Up, after pressing Photo Library option, the screen freezes after selecting any photo and i have to relaunch the apps. This never happen before.

And yes, in What's Up settings i have selected Photos as an option.

Could anybody give an idea how to solve the problem??

Best regards

Ines