Can you share your code for the IV10 macro?
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Inventor Professional 2012 SP1 (25 seats with subscription)
Windows 7 64 bit
Lenovo D20, 12 GB RAM, Intel Xeon X5687 3.6 GHz, SSD
Quadro 4000, driver 8.17.12.9573, dual monitors
SpacePilot, driver version 6.15.3 Firmware 3.12