As answered in the other topic, you should open a support ticket directly or by email (firstname.lastname@example.org) so they can check your server status.
I had the same problem and the solution may help others in the future (especially those new to the platform like me).
The problem I had was an infinite loop on the Preparation action of my HomePage which rendered the application unresponsive. The solution was simply to correct the bug :)
Nevertheless, I have to praise OutSystem's support team. Even though a colleague at work helped me find the bug 3 minutes before OutSystems' support team answered my email, I'm amazed at their professionalism - they looked into my code, found the bug and sent me a concise email describing where it was and how to correct it. Great work!