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Zbrush 4r7 Zsphere typology red line

Hi there,

I’m currently in the process of learning zsphere typology when I ran into an odd issue.

At one point I had a red line connect to a point and the cursor, I would wave the cursor around and this red line would follow.

After spamming some random buttons it would go, but I still don’t know why it happened.

Any idea why it happens? and how to get rid of it?

I can upload an image if needed

I found a video with the same problem: