Any Ideas? Help please.
It's a bug. Adobe thought they had it fixed. They're working on it now. But it IS a conflict between Sierra and Photoshop. There's a way to back-grade to el Capitan, but it takes quite a while and it is not easy to back-or down-grade your Mail files from a newer to an older OS.
You are running an un-patched version of CS6. The latest version of CS6 for Mac is 13.0.6: