I've been using LR 4.3 for quite some time without issue. Today i tried to rename some images in a new number order, but was unsuccessful. I then tried to export these images to a USB, unsuccessfully.
I now find that whichever folder I'm in and wherever I try to export images to, I get an error message stating that 'an unknown error occurred, the photos were not rendered.'
I've tried Discarding and then Rendering 1:1 to no avail. I'm totally frustrated as my work depends on this. Can someone please tell me how to resolve this issue. Many thanks.