Hey,
it seems like the minify server doesn't work anymore (trying for almost 2 hours now). Export works fine with no minify. When selecting simple or advanced, export doesn't work.
Also tried with a new empty project, same problem...
I just tried it and it's working fine for me right now. The server uptime shows it's been running since at least a few hours before the time of your post.
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cleared the browser cache, now the minifier works again.