osu! freezes when I click a link or multiplayer map!

Make sure you're not running osu! in compatibility mode through the osu!.exe propreties and make sure that you have a default browser set.

Right click the osu!.exe file in the osu! installation folder and click on Propreties, then go to the Compatibility tab and make sure that the checkbox under Compatibility mode is NOT checked.

If you're not running osu! in compatibility mode and the issue persists, make sure you have a default browser set. For some users that have Chrome as their default browser the issue will still occur for unknown reasons, so try setting Internet Explorer as the default browser and see if your issue persists after that.