We are having a problem with Inventor Pro 2012 not responding. We just moved to Windows 7 with new work stations and moved up to 2012 form 2010. Our computers are Lenovo ThinkStation D20's. They are 64 bit systems with 32 GB of RAM, Intel Xeon E5606 2.13 GHz processors and Nvidia Quadro 5000 video cards with 2.5 GB of memory. Frequently while working Inventor has to stop and 'Think' when it does we get a message at the top of the window that says 'Inventor Not Responding'. This 'Thinking' process can take anywhere from 30 seconds to several minutes then it will allow us to start working again. It does this reguardless of the size of the file we are working with and is becomming more frequent. Is there a setting that could have been overlooked when installing? Is anyone else having this problem?