Whenever I try to open a photograph in photoshop, attach a photograph to an email or open a photograph in a word document from iphoto, it only allows me to do it once and then I have to close the programme or restart the imac. For example I can choose a picture to open in photoshop and it opens, I try again and the 'open' choice doesn't highlight so I have to quit photoshop and do it again. The same for email, I can't attach more than one photograph to an email, even if I do a new email after the first insert of a photograph it wont let me open another in any way. Im quite confused the imac is from 2010, I3 4GB if that helps, Please help it's really annoying. Thanks.