LR 5.2 breaks Red Eye corrections that were applied in LR 4 in Process Version 2012. In LR 4, a Darken value of +100 darkens the adjustment, but in LR 5.2, it lightens it. As a result, photos with red-eye applied in LR 4 can look significantly different in LR 5.2.
This bug was corrected in ACR 8.1, but the fix did not get into LR 5.2?
http://blogs.adobe.com/lightroomjourn...
It would be great if the LR team could quickly acknowledge that this is a bug that will be fixed in the future, so we can plan temporary workarounds accordingly.
The image below shows how LR 4 interprets Darken = -100 (left eye) and +100 (right eye):
And this one shows how LR 5 interprets the same values: