somehow your post slipped … 
note – I’m on Windows
- opened & developed a raw-file in portrait orientation in AP2
- chose CEP5 and the pic appeared & was saved in portrait orientation
Did you try other pics too?
Can you try with pics from another cam?
- Checked the very same file with HDR2 – still one of the old moduls within Nik Collection 5.4
(NC 3.x: AnalogEfex 2, ColorEfex 4, DFine 2, HDR 2, Sharpener Pro 3, SilverEfex 2, Viveza 2)
and it took a little longer to load the file than it’s ‘siblings’, which is normal – but not minutes.
The ‘new’ NC versions run much quicker than the ‘old’ ones in AP2.
But I also prefer the old interface.
- I use the new and the old versions → more here …
( this works for me / don’t know if it does so on Mac ! )
.
note – Perspective Efex does NOT work as PlugIn in AP / AP2
Wolfgang