I don’t understand why but the lasso tool (with masking at least) won’t trace completely, it always stops and drops after I draw a little and I can’t complete my stroke. So I’m forced to draw multiple times to make my selection.
Why that?
Thank you.
I have seen also that problem. In my case it seems linked to time. If I draw quick enough I can do very complex lasso patterns. If I’m slow it will cut me before finishing. It cuts me after around 6-7 seconds in a consistent way.
I think that might also be the case for me, I’m not in front of zbrush now but I’ll investigate that.
Did you get any solution for this?
No solution (at least from me), it seems to me that has been always there. Simply sometimes you don’t notice if you are quick enough. It is obviously frustrating that can (will) fail in the longer and more elaborated patterns. But as workaround you can do them in several stages.
Thank you again 
I’m with Altea on this. Lasso masking (usually lazily) the morning after a boozing session causes the same issues for me. Some things are best done while we are at our sharpest I think.
lol, that’s right.
But I think it’s not normal for such an highend software and should be fixed, as it causes issues down the line.