Curve selection not working

Every once in a while, in the middle of working on a model, my curve selection abilities suddenly stop working. I still seem to be able to select curves by dragging a box over them, but when I click directly, the selection options box flashes very quickly, but does not stay open to allow me to choose between the curve, polysurface, etc. I can’t seem to figure out why this happens. Has anyone else had this problem?

Hi Lauren - I’ve seen this happen intermittently on my mac running Windows 8.1 and Rhino, but not in Rhino for Mac. I can never reproduce it when I want to make a bug report.


I have had this problem too on my MBP a couple of times with RC1. Crossing selection didn’t work either…

Software information

Software versions
Rhinoceros version: 5.0 WIP (5A814w)
IronPython version: 5.1.2015.131
Language: en (MacOS default)
OS X version: Version 10.10.3 (Build 14D136)


Third party kernel extensions

Hardware information

Computer hardware
Hardware model: MacBookPro5,2
Processor: Intel Core2 Duo CPU T9600 @ 2.80GHz
Memory: 4 GB
Architecture: Intel 64 bit

Video hardware
Graphics: NVIDIA GeForce 9600M GT 512 MB
Memory: 512 MB
Screen size: 2560 x 1440, 1920 x 1200
Displays: LED Cinema Display (109dpi 1x), Color LCD (133dpi 1x)

USB devices
Apple Inc.: Built-in iSight
Apple Inc.: Display iSight
Apple Inc.: Display Audio
Apple Inc.: Apple LED Cinema Display
Apple, Inc.: Apple Internal Keyboard / Trackpad
Apple Computer, Inc.: IR Receiver
Logitech: USB Receiver
Apple Inc.: Bluetooth USB Host Controller

Bluetooth devices
Apple: Apple Wireless Keyboard
Apple: Apple Wireless Mouse
Apple: Apple Wireless Trackpad

OpenGL information

OpenGL software
OpenGL version: 2.1 NVIDIA-10.0.31 310.90.10.05b12
Render version: 2.1
Shading language: 1.20
Maximum texture size: 8192 x 8192
Z-buffer depth: 24 bits
Maximum viewport size: 8192 x 8192

Implementation settings
Use texture compression: No

Appearance settings
Antialiasing: 2x
Mip map filtering: None
Anisotropic filtering: None


I’ve experienced this as well. In my case, it seems to happen when I have a curve that’s co planar with a surface or polysurface edge, which I noted last week. It’s one of those frustrating intermittent problems that’s very difficult to reproduce!