Pownce issues

When I first started using Pownce, I thought that I’d never have any issues with the service. These days however, I can’t post a thing on it. Every time I try to post a message, it refuses to post and reports a message as pictured below:

I’ve tried powncing from all possible devices: computer, iPod and mobile phone but nothing. Also, when I try to download the new Pownce desktop app, I cannot unzip it properly even though I have Adobe AIR installed on my system. Deleting cookies didn’t help. Any ideas are more then welcome, leave a comment.