Thank you! Hmm, looking at the log you've emailed, this is actually a crash in the JVM. I'm not sure what causes these sometimes - some kind of system issue/incompatibility is my guess. Switching to Java 8
might fix this (and, conversely, if this happens with Java 8, going back to 7 might resolve it - this isn't a problem unique to 7.)
But the other crashes not leaving a log like this means it could also be something else. If you remember when those were, roughly, you could check Windows Event Viewer for errors around that time. I could, for example, see this crash being caused by a graphics driver problem, or something similar.
(In all honesty, kudos to you because this is the first crash I've ever had and I've been playing for over 10 years. That's seriously impressive for in-dev software!)
(Hah, thank you! Mostly your luck if we're being honest - there's definitely been crash bugs over the years!)