Fix turned images

my file of chose is my pitchers, some of the photos were on their side "turned the wrong way" They are now turned the right way in the file but they still show on Wallch the wrong way around,

 How do I get them to show the right way?
 is there a cache file that I need to clean out? Hiding somewhere? or can I do a restart with the same file now that the photos are facing the right way and if so how do I do that?

 I love Wallch it rocks and never fails. I have it on all 3 of my computer
 but this little problem is driving my mother nuts she had added the photos to the file that Wallch is using, then a few days later turned them the right way around and Wallch does not see that.
I Thank you for any help you can give me.