7.0.0-rc1 Dies Silently

[SirWobbyTheFirst]

So I've tried upgrading from 6.6.2 to the 7.0.0-rc1 build and despite the install going fine, 7.0.0-rc1 just never starts, the first time I tried Avast's service went up in CPU usage (Checked via Task Manager), which I attributed to it doing its deep scan thing that it does when it doesn't recognise an executable and then after that Avast settled back down and LiveCode's executable simply exited.

No error message, nada. So I tried again, LiveCode's executable shows up in Task Manager with no CPU usage and after about 2-3 minutes, simply exits again. No error message. Anyone got any ideas about how we can trace the startup to see what might be causing it not to startup on my machine? The only deciding factor with my machine is that it runs Windows 8.1.

Any thoughts? There isn't a bug that I've discovered yet so I don't think this could be put up on the QCC yet.