CentOS, Nvidia GTX 1070
Broken: 2.79b, latest master d53093953f8
Short description of error
When you simultaneously scale back to 1 or transform back to 1 (all axis) multiple objects via numeric input in the object panel holding Alt, you'll get a wrong result except for the last selected object.
Exact steps for others to reproduce the error
Open up the blend file
Select all the cubes
Go to Properties -> Object -> Transform
Hold Alt and drag-select all three axis
May be the following is also related: you can't change all three values in the Dimensions section of N-panel at the same time.