Hi! Inventor should never crash. Please try the following and see if it helps.
1) Install all critical Windows updates and the latest graphics driver.
2) Install the latest Inventor update.
3) Clean up %temp%.
4) Make sure C:\Temp folder is available and open the assembly -> press Ctrl+F7 and scroll to the bottom of the dialog. Is there any bad body reported? If yes, please open the file containing the bad body and run through Repair Bodies workflow.
Please send me an email johnson.shiue@autodesk.com. I would like to dig up the crash report to understand the crash better.
Many thanks!
Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer