Thank you for the comments! After looking at some of the other wxwidgets projects I was starting to suspect wxmaxima as well on the crash front.

I will do some further investigating when I have some time, aiming to get the issues fixed upstream if appropriate. I'd like to get it working, but it's been a while since I've done development, so if there are any other wxmaxima users out there who'd like to help speed things up, they can feel free to contact me to put our heads together.