Not a problem at all with any of the fillets. I haven't had any crashes period.
The only thing I did notice and I'm glad you reminded me. When I made the wheels I rotated a profile and then made a four object array.
When I went to mirror all four wheels at the same time it seemed to bring the program to its knees.The mirrored objects weren't even visible for about 10 seconds.
See if you can duplicate it. I just tried it again and it is repeatable. I didn't have any problems mirroring anything else and I used it quite a bit.
Do you need my specs or do you have them already?