Operating system and graphics card
OS X 10.8.5
Graphics AMD Radeon HD 6490M 256 MB
Broken: Blender 2.69
Short description of error
The Limit Scale constraint fails with a minimum value of 0.0. The user is able to bypass the minimum and scale all the way "down" to the negative maximum value. It is easiest to bypass the minimum value at 0.0. It is also possible at values close to zero such as 0.2 or 0.4, but the user must move the mouse rather quickly to jump over the minimum value into the negative side.
Exact steps for others to reproduce the error
This is reproducible with the default blend or with the attached.