I have a problem with Blender 2.76 running on Ubuntu 15.10 (and probably other systems, too.)
When I move an object in Object Mode or a vertex in Edit Mode using the Grab key G and enter a distance (e.g. 50cm on Z), the object or vertex will almost always move by a distance slightly different. Attached is a screenshot with GZ 50cm and the resulting distance of 49.9998cm.
Why does this happen and how is it possible to move an object or vertex exactly 50cm, 1 Blender unit, 1µm etc.? Entering 50.00000 or other values does not seem to work either.
Edit: While, as brasshat said, the error is insignificant, a value of for example 49.9998cm is aesthetically unpleasing and makes reading and editing of such values very hard.
When more complex values like 32.275 become 32.27487 (this really happens), this interferes with the workflow, especially when tight tolerances are required (CAD, 3D printing, etc.).