RESOLVED: Update to latest cutting-edge version and upload, it will work.
Problem Details: When I upload a new map, it always stucks at the last step (distributing to global network) and never move on. I could only click cancel to stop it. But in fact, the map was actually uploaded. It got a BeatmapSetID and an information page, like https://osu.ppy.sh/s/226242 , it's also download-able and the .osz got the correct content. BUT, the map doesn't have a thread, and this is the problem.
Note that I can update other maps (alraedy uploaded) of mine so I think my network should be alright.
I also tried to upload another new map, and it's unsuccessfully uploaded either https://osu.ppy.sh/s/226292 . So I think it shouldn't be the particular map's problem.
Video or screenshot showing the problem:
osu! version: 20141015.1 (latest)
I consulted Scorpiour and Marcin and they told me to post here.
Hope somebody could help me x.x
Tnank you.