Strange, non-undoable transformation bug

When I tried to rotate two objects this is what happened: https://dl.dropboxusercontent.com/s/912w3n8e6n4awq9/transformBug_nonUndoable.mkv
One of them disappeared. After undo, it reappeared but with shifted position and some random orientation. I couldn't make it return to original position/orientation.

I was working with a workplane, with view navigation set to it.

Manipulator orientation was set to World (Workplane) and its position to Selection.

I couldn't reproduce the bug. Can you save the two little things to a scene file and load it see if you can reproduce the bug? if can, please send me the file along with your config files.

Hello IStonia.
I already tried to reproduce it, but it didn't occur. It appears to be random.
I'm sorry, but I don't have the scene file from before it happened. I was in a hurry with this model, so I just kept on modelling and probably have overwritten the file or something. But this bug seems to be very rare as I don't remember it occurring in the past.

P. S. Maybe it's because I didn't notice I was working in a very small scale? Those objects were 0.6 mm in size!