Indeed, works for 0.457a 32-bit too.
To reproduce:
1. Stop streaming and previewing
2. Create new global source (I've made an Image Source)
3. Use it in one of your scenes
4. Remove the global source from Global Sources window.
To make it crash in two ways:
a) Start preview or streaming and see the out of range error when clicking on the removed source ins 'Sources:'
b) Right click on the removed source in 'Sources:' without starting the stream or preview, and see the 'Oops, OBS has crashed' error
I haven't got any 64-bit system at the moment to check :)