Inventor Crashes when using Text Editor

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I am trying to dimension a countersunk hole in Inventor 2018, and when I click the Hole and Thread icon nothing happens. When I try to create the dimension manually, I am able to type in the diameter, but when I click on any of the symbols in the text editor in the right column (countersink for this example), I receive the following error:
"Error: There is not enough memory to complete this operation. Try closing other applications to free more memory."
I have no other applications open, and don't even have other models/drawings open. My task manager shows that I have plenty of memory available, yet the window does not close no mater how many times I click "X" or "OK".
Has anyone seen this error before? If so, any recommendations to fix it or enter the countersink dimension in another way?
Thanks!