Welcome to the forums.
I would start by going to Settings>Apps>swipe over to all apps. Look for either a photo editor or Gallery and click on it. Then click clear cache.
i am unable to save edited photos and even save photos from facebook. i was able to save before but nw its says unable to save or sd card full. i formated the sd card still it says the same. i even tried uninstaling and reinstaling google+ and also cleared cache of all the apps. please help.
If the folder existed before the update to KitKat, you have to save the files on a computer, delete the folder, let the app create the folder again, copy the files back to the folder, then the app can save files to the folder.
If you still can't save your edited photos, I think you should try another photo editor. Discount and Promo Codes for Photo Editor Software is available on IfCoupons. You can have a look!