Updated my drivers, deleted the cache file. It’s annoying.
I’m just an RM user but have you added new animations recently? What happens if you open a new project? Does it have the same issue? I’ve never experienced this issue myself, but sometimes depending on what you do some animations might have data that the editor can’t deal with.
Like, one way I’ve made RMXP crash is by editing the animation from outside the editor (with a custom animation) and adding data the editor wasn’t expecting like more than 16 sprites and so on 
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If I’m not mistaken this is the animation selector from MZ, right?