New answers tagged scaling
As @horatio pointed, it's pretty normal loosing the details while zooming on a fixed size image. Assuming that the final destination of your image is a web page, when you perform a zoom operation the browser scales the raster images, usually by interpolation. If you are interested to a web page that can be zoomed, you can use directly SVG as image format ...
I've tried under Windows with your version and with the most recent one and it works as usual. In order to maintain the border stroke while scaling the object, the first button should be up (in your screenshot seems to be down, i.e. the stroke is scaled with the object):
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