The problem is it will work fine sometimes, sometimes it'll crash. Just had a session where I could do change topology of a mesh used in a Distance Map for 30 minutes without a problem, then it suddenly crashes to desktop, even without IR running... I guess it crashed during material editor update or something. So I can't guarantee it'll crash for you even if it does for me. It's reproducible, but once in a while only, hence the minidump which I thought would be enough ;)
You have probably a lot on your desk but I'm pretty sure you'll see it yourself if you spend 10 minutes tweaking a mesh used in a Distance Map.