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Topology Brush sometimes doesn't recognize quadrangle (version 4R6 for Mac OS X)

I’m running into a problem when using the Topology Brush in ZBrush for Mac OS X version 4r6.
I’ve got some design where I just can’t add a quadrangle next to one of the existing lines.
(Adding a triangle works fine, though.)

Here’s project file, a screenshot, and also a video to document the problem.

Note: For trying out the example, select the Topology Brush and set Draw Size = 10.

[video=youtube_share;RNnGvkeaoYU]http://youtu.be/RNnGvkeaoYU[/video]

Attachments

TopoBrush no Quadrangle.jpg

TopoBrush no Quadrangle.ZPR.zip (40.5 KB)