We have exactly the same problem here using a brand new iMac and Win 7 64, but it gets worse!
Firstly, our hardware details are:
This Direct3D graphics driver is not Microsoft WHQL certified
Graphics Hardware Description:
ATI Technologies Inc. ATI display adapter (0x944A)
AIRViz Device Manager \ VirtualDeviceDx10
Feature Level 4_5
Hardware Renderer
Graphics driver file atiumd64.dll,atidxx64.dll,atiumdag,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll is version 8.661.0.0
Current optimization settings are not known
The display is using 32-bit color
Inventor Version:
Build: 239, Release: 2011 RTM - Date: Wed 02/17/2010
64-Bit Edition - 8192.00 GB
Loaded Inventor Add-Ins:
Routed Systems: Tube & Pipe
Assembly Bonus Tools
iLogic
Simulation: Dynamic Simulation
Autodesk Mold Design
Inventor Vault
Simulation: Frame Analysis
Content Center
Inventor Studio
Design Accelerator
EDM Addin
Frame Generator
AEC Exchange
Routed Systems: Cable & Harness
iCopy
Content Center Item Translator
Drag & Drop Interoperability
Simulation: Stress Analysis
Autodesk DWF Markup Manager
System Information:
Operating System: 64-bit Microsoft Windows 7 Professional (Build 7600)
Language: English
System Manufacturer: Apple Inc.
System Model: iMac11,1
BIOS: Default System BIOS
Processor: Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz (1 processor, 4 cores, Hyperthreading enabled)
System Memory: 7.990 GB RAM
Graphics Device Information:
Renderer: HAL
Manufacturer: ATI Technologies Inc.
Chip Type: ATI display adapter (0x944A)
DAC Type: Internal DAC(400MHz)
Graphics HW Memory: 512 MB
Display Mode: 2560 x 1440 (32 bit) (59 Hz)
Graphics driver file: atiumd64.dll,atidxx64.dll,atiumdag,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll
Driver file version: 8.661.0.0
Driver Date: 23 September 2009 0:00:00 UTC (Coordinated Universal Time)
Direct3D Graphics Device Information:
Adapter Description: ATI Radeon HD 4850
Vendor ID string: 0x00001002
Device ID string: 0x0000944a
VendorID: 1002
DeviceID: 944a
SubSystemID: b5106b
Revision: 0
Direct3D 10 / DXGI System Information:
Dedicated Video Memory: 504 MB
Dedicated System Memory: 0 MB
Shared System Memory: 2.996 GB
DxDiag System Information:
Operating System: Windows 7 Professional 64-bit (6.1, Build 7600) (7600.win7_gdr.100226-1909)
Language: English (Regional Setting: English)
System Manufacturer: Apple Inc.
System Model: iMac11,1
BIOS: Default System BIOS
Processor: Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz (8 CPUs), ~2.8GHz
System Memory: 8192MB RAM
Page File: 2671MB used, 13690MB available
DirectX Version: DirectX 11
DxDiag Version: 6.01.7600.16385
DxDiag Graphics Device Information:
DirectX Version: 10.0
DDI Version: 10.1
DDI Version Number: a
DxDiag WHQL Level: 0
Driver Signed Valid: True
Driver Signed: True
Manufacturer: ATI Technologies Inc.
Chip Type: ATI display adapter (0x944A)
DAC Type: Internal DAC(400MHz)
Revision:
Graphics HW Memory: 3571 MB
Display Mode: 2560 x 1440 (32 bit) (59Hz)
Graphics driver file: atiumd64.dll,atidxx64.dll,atiumdag,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll
Driver file version: 8.14.0010.0700
Driver Date: 1/16/2010 15:16:14
WHQL Level: 1
Inventor Options Information:
Options = 0x00000000
Warning Options = 0x00000000
Apart from the annoying "buffered last click" of the mouse wheel during zoom, I believe the same fault prevents us from making centreline measurements between two circles or cylinders. During the measure operation, and scrolling between the "select other" options using the mousewheel, we scroll to the centreline option, but when the left mouse button is clicked, the software selects a different option! Have tried everything to resolve, including Win 7 (64) video driver changes for the HD4850, along with all the video options in Inventor. No luck. We are now thinking of switching back to 2010. Does anybody out there have an import/export routine available so that I can convert my 2011 files back to 2010?