Save duplicate suddenly works differently

Rhino Rhino for Mac
2

Great, now I can’t edit my post; error:
The tag “unhandled” may only be removed by staff.

Anyway:

Software information

Software versions
Rhinoceros version: 5.4.1 (5E409)
Rhinoceros path: /Applications/Rhinoceros.app
IronPython version: 5.1.2015.131
Language: en (MacOS default)
macOS version: Version 10.10.5 (Build 14F27)

Plug-ins
None

Third party kernel extensions
None

Hardware information

Computer hardware
Hardware model: MacBookPro11,3
Processor: Intel Core i7-4850HQ CPU @ 2.30GHz
Memory: 16 GB
Architecture: Intel 64 bit

Video hardware
Graphics: NVIDIA GeForce GT 750M 2048 MB
Memory: 2048 MB
Screen size: 1680 x 1050
Displays: Color LCD (258dpi 2x)

USB devices
Apple: Internal Memory Card Reader
A4TECH: USB Device
Apple Inc.: Apple Internal Keyboard / Trackpad
Apple Inc.: Bluetooth USB Host Controller

Bluetooth devices
None

OpenGL information

OpenGL software
OpenGL version: 2.1 NVIDIA-10.4.2 310.41.35f01
Render version: 2.1
Shading language: 1.20
Maximum texture size: 16384 x 16384
Z-buffer depth: 24 bits
Maximum viewport size: 16384 x 16384

Implementation settings
Use texture compression: No

Appearance settings
Antialiasing: 4x
Mip map filtering: None
Anisotropic filtering: None