Does this happen with all videos or just the ones hosted by catbox.moe. catbox.moe load times can vary wildly depending on the location you are trying to access it from, so it's possible the timeout causes the client to crash.
Ah... yep. Turning off autoplay allows me to open the post on 0.2.1. If there's a publicly-available CI download link that has the nightly builds, I'd be happy to test it with autoplay enabled with the nightly.