The enclosed file shows two small surfaces that previously rendered in Shaded mode. I did a nearby trim and these two surfaces will no longer Shade (but all others in the area still do), but now display in Wireframe, no matter what display mode is selected.
I copied them into a new file in v508 and the same result occurred. I then rebuilt them and they shaded just fine.
Thought this might be of interest.
~Dave
Shading_Error.3dm (86.7 KB)
Software information
Software versions
Rhinoceros version: 5.0 Wenatchee 2014-04-01 (508)
OS X version: Version 10.7.5 (Build 11G63)
Plug-ins
None
Hardware information
Computer hardware
Hardware model: MacBookPro8,3
Processor: Intel Core i7-2860QM CPU @ 2.50GHz
Memory: 16 GB
Architecture: Intel 64 bit
Video hardware
Graphics: AMD Radeon HD 6770M 1024 MB
Memory: 1024 MB
Screen size: 1920 x 1200, 1920 x 1200
Displays: Cinema HD, Color LCD
Third party kernel extensions
com.Logitech.Control Center.HID Driver (3.6.0)
com.Logitech.Unifying.HID Driver (1.2.0)
com.parallels.kext.prl_usb_connect (7.0 15107.796624)
com.parallels.kext.prl_hypervisor (7.0 15107.796624)
com.parallels.kext.prl_hid_hook (7.0 15107.796624)
com.parallels.kext.prl_netbridge (7.0 15107.796624)
com.parallels.kext.prl_vnic (7.0 15107.796624)
USB devices
Logitech: USB Receiver
Apple Inc.: Apple Internal Keyboard / Trackpad
Apple Inc.: Bluetooth USB Host Controller
Apple Inc.: FaceTime HD Camera (Built-in)
Apple Inc.: iPhone
Apple Computer, Inc.: IR Receiver
Bluetooth devices
None
OpenGL information
OpenGL software
OpenGL version: 2.1 ATI-7.32.12
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