Difficult if not impossible to drag shapes vertically.

What steps will reproduce the problem?

1. Create a box. Do not use a floor.
2. Create a slider joint pointing upwards.
3. Click the Joint-Connect Tool.
4. Click the box.
5. CTRL (Windows) or ALT (OSX) click the slider.
6. Hit Run.
7. Attempt to drag the box up and down.

What is the expected output? What do you see instead?

The box should slide along the vertical slider. Instead, the box stays where it 
is no matter what direction you drag it. Occasionally you might see it jump.

What version of the product are you using? On what operating system?

Sketchup 8, SP32Dec2, OS 10.6.5 (Intel)

Please provide any additional information below.

Original issue reported on code.google.com by Robert.C...@gmail.com on 21 Dec 2010 at 5:08

Attachments:

[Vertical slider.skp](https://storage.googleapis.com/google-code-attachments/sketchyphysics/issue-62/comment-0/Vertical slider.skp)

rfdiazpr / sketchyphysics

Difficult if not impossible to drag shapes vertically. #62