I don't know if this has to do with Construct r91 still being beta, but when I set my games' fullscreen parameter to "letterbox integer scale" the point sampling doesn't seem to be working.
The Mario sprite to the left is original-sized and shouldn't look as blurry as it does.
Firefox (Windows) - Doesn't work
Internet Explorer (Windows) - Doesn't work
Safari (Windows) - Doesn't work
Opera (Windows) - Doesn't work
Firefox (OSX) - Works
Opera (OSX) - Doesn't work
Chrome (OSX) - Works
Safari (OSX) - Doesn't work
I asked some other people to test it as well:
One guy tested in Chrome on Windows 7 - Worked.
Another guy tested in Firefox on Windows 7 - Worked.
Another guy tested in Chrome on Windows 7 - Worked.
Another one tested in Opera on Windows 7 - Didn't work.
One guy tested on OSX Opera with an old "11 MacBook Pro - Didn't work.
The second guy tested on Firefox on Windows 7 64-bit with a GTX 560 - Worked.
Third one was on on Chrome on Windows 7 with a GTX 560 Ti - Didn't work.
The last guy was on Windows 7 64-bit with Intel HD graphics - Didn't work in Firefox or Internet Explorer, but worked in Chrome