I did what you said and captured the process with SolidWorks Rx. - However, I am off subscription so I don't know that I will get help from my VAR.
Then I did the second step you suggested and, using SolidWorks Rx, opened in OpenGL Mode.
Had the same problem, only difference was didn't see the error message when SW crashed.
Then did the 3rd step - bypassing the Tools/Options settings. IT WORKED.
This confirms it is one of my settings (that I probably made when I started using 2015. I think at that time I started with a fresh install and did not re-use my old settings from previous versions.
Now I just need to figure out what setting could cause this.
You gave me a great pointer in the right direction and confirmed it is my settings that are the problem.
After a bunch of trial and error - comparing System Options from the GENERIC Options settings (bypassing MY system options) with my system options I found the culprit.
My Settings (Crashes): Modified attempt (still crashes)
Generic Settings (works fine):
I restored all my original SYSTEM settings from my last saved "Copy Settings Wizard", and then tried checking and un-checking these options and had the same results.
Looks like it doesn't like the "on screen numeric input on entry creation".
A shame because that is the way I like to work.
Now I will have to not use the Midline function or not use the numeric input option.
Decisions, Decisions, Decisions
I am glad that you had found out the root cause, and thanks for sharing of the troubleshooting process.
By right, the setting should not cause crashing issue, so you may send the Rx file to VAR and see if they can submit to SOLIDWORKS Technical support for further investigation. If your VAR has an SR number for this issue, please let me know.