When I have a full-size Rectangle with a 1px border on all sides, the right side gets cut off on my non Retina screen in Safari. However, when I disable the 'Use WebKit graphics acceleration' it works as intended.
For illustration purposes:
On all other browsers (Chrome, FireFox, Opera) on both Retina and Regular and on Safari on Retina:
On Safari on regular screen (non Retina):
And the HypeFile:
weirdBorderOnSafari.hype.zip (8.4 KB)