In the current beta version,the corner for the control center doesn't work.
That's an known issue and will hopefully be fixed with the next update.
You can open the control center using the icon until it's fixed.

When does the issue happen? Update to deepin 15.5beta? The previous version?

It happens in 15.5 beta on Deepin OS and in the version from Arch Linux official repositories,too.
That's named 15.5 beta,too,but I get updates more often so it needn't be exactly the same release.

we all have the problem,its that one sort of thing you have to take for some time if you are a Deepin fan

OK. That's the common issue in deepin15.5 beta and soon you will get deepin 15.5 final. Tomorrow or the next week.

asap         

Edited by ferdianza at 2017-12-14 01:27

ok, I think I got the same problem, I just fresh Install deepin os today, I got problem to setting up corner. I try to right-click setting corner but suddenly it disappears. my desktop stuck for a while and than I can't use corner anymore. But corner will fix after rebooting or logout.
OK solve !

My Issue is because Nvidia driver. after I reverse to xorg driver, anything is fine.

Ferdianza, I also suffer from the same problem, same type. Do you know how to solve. Can I copy your text and create a topic with it?

Ferdianza, eu também sofro desde mesmo problema, tipo, igual mesmo. Você sabe como resolver ?. Eu posso copiar esse seu texto e criar um tópico com ele ?