Yeah I'd like to know how to let other people see my skins - I naively assumed that this functionality was included... the game asks you whether you're OK with uploading your custom skin when you go online with it the first time

I have the same problem, it's the installer that freezes, not the computer: my CPU usage is around 30% and physical memory at 35%, just 2 apps with "not responding" - 'Setup' and 'Setup - ManiaPlanet'. I will leave it for an hour or so when I have dinner but don't suppose it'll unfreeze.