I've had that happen on my iPhone, too. Sometimes if I hit the back arrow, the safari back button, it will bring it back, but not alwaysOn my iphone if I add a picture I have to touch the page/screen outside of the text entry box. Then I can select the text entry box and continue on my way. If I add a pic and then touch inside the text entry box then the whole thing is gone and I'm logged out. I don't know how the heck that happens.