ZBrushCentral

Help..

Hi guys,

Working on topology but cant continue it. dont know what the problem is.
Help please

Look video to see problem… when I hit edit topology i cant screen rotate or edit my topo

https://www.youtube.com/watch?v=242S21SoGx0&feature=youtu.be

Here is exact problem… there should somebody that know a solution… right?

https://www.youtube.com/watch?v=qxzwPZyVLbw&feature=youtu.be