Problems with positioning in illustrator - how to deal with it?

Question

Design

In general, something spontaneously switches off at the chandelier and it starts positioning objects as it pleases. Context - pixel-perfect design for devices. 1 pixel grid, align to pixel grid and snap to grid don't help. I tried to work in documents that were originally created with align to pixel grid, I tried without this checkbox (and then put it in the object transformation panel), and this and that and that - all the same, the chandelier periodically starts to set fractional coordinates or sizes.
Maybe there is some setting in the chandelier (the video card is there, or something else that is not obvious), which will fix everything?
This shit has been going on since CS6.

Answer 1

Answer 2

Several reasons why this might be:
1. Artboard has fractional values ​​or coordinates.
2. Masks have problems with positioning (Clipping Mask) if there are objects with fractional values ​​inside the mask.
PS: In SS2014 there was a bug with shapes, when scaling by hand, the shapes stopped sticking to the grid or something else correctly, fractional values ​​appeared, as a temporary solution, Adobe offered to convert the shapes into objects (Object -> Shape -> Expand Shape). Fixed in SS2015.