I’m glad you were able to load to the UseGalaxy.org server as a work-around!
The UseGalaxy.eu server just seems to be busy. I see many unscheduled and queued jobs for the Upload tool – named DATA FETCH in these graphs.
Where → How to see the UseGalaxy.eu job queue statistics
The best advice we can give is to get your data queued then allow it to process. For local data, you’ll need to stay connected. For cloud data, this will process while you are away. The same is true when it comes time to download the results, too.
Hope this helps! The EU administrators are watching what we are talking about here and will jump in if there is anything special to report. 