System Information
Linux Mint 17.1 x64
nVidia GeForce GTX 770 using proprietary driver

Blender Version
Broken: 2.75
Worked: 2.74

Short description of error
When adjusting any input field using Shift+Alt+Drag, the minimum increment now seems to be at least one order of magnitude bigger than it used to be in 2.74. For some fields, like the object location, the precision seems to be the same as before, but some other fields have changed dramatically. (Also, the 3D cursor location fields are using a different precision than the object location fields.)
One instance where this is not only extremely noticable but also kinda breaks a feature for me is when trying to precisely adjust a background image, because the size field will now only work on two digits of precision, but it used to work on three digits in the last version.
This becomes even more extreme when working in metric units, because at scale 1.0 the minimum increment is now 10cm, which is completely unworkable. It used to work on 0.001 level, independently of the unit system.

Exact steps for others to reproduce the error

• open Blender
• add a background image to your scene
• adjust the background image size with Shift+Alt+Left-Mouse-Dragging
• notice the increment of 0.01 when using Blender units, 0.1 when using metric units.