I have vector artwork that is not aligned to a pixel grid in Illustrator. In CS5, I would be able to paste the vector object as a smart object into Photoshop file that was larger than the illustrator image and resize larger while holding shift to keep the ratio the same.
However with Creative Cloud, if I have a square in Illustrator that happens to be 17.3px by 17.3, then paste to Photoshop in a file that has a larger canvas than the paste, I get uneven horizontal and vertical ratios (width = 18; height = 17). It seems to overestimate the width and make it appear fatter horizontally (which is the wrong aspect ratio). This is very noticeable when vector objects (like perfect circles and small icons) get scaled up in Photoshop.
I have tried unchecking and checking "Snap Vector Tools and transforms to Pixel Grid" but this doesn't seem to fix it.
The only way I've been able to get this ratio to be kept is to create a new document with the size automatically changed to clipboard dimensions (which are the desired 17x17). When you paste as smart object, it now uses the correct aspect ratio.
When you paste an object into Photoshop take a look at your options bar to see if the Maintain Aspect Ratio button is checked. I'm guessing that it isn't which is why Illustrator objects are being pasted at different heights and widths. As you can see in the image below, a perfect circle from Illustrator is being placed in Photoshop at 100.05% and 99.44%. By checking the link button between the two percentages the numbers get locked to the same percentage so that the object is pasted in at the correct dimensions.
That seems to work like the behavior of CS5.
Is there a setting to auto-check this, or do I have to do this for each and every paste? It seems strange that it would default to something like W:104.05% and H:98.27%, which is what I get for pasting a 17.3 px square.