Back again. I’ve tried both files, opening the 4.3 version under 4.7.2 and the 4.6.1 under the corresponding version as well as 4.7.2. I’ve been getting the same crash as before, without exception.
Another recent Answerhub entry describes the exact same issue, crash when rendering to movie. The Editor itself runs fine, just the recording window undergoes critical existence failure.
I’ve appended two logs on Pastebin, corresponding to the 4.3 file run under 4.7.2 and the 4.6.1 file run on its own version. They both have timestamps of when I tried them, so you can check the error reports received at the time to compare / confirm.
I can provide more info as necessary, though everything points towards this being an error not related to any given project or asset, but rather the engine encountering an error somewhere along the way.