Thank you, its a good point.
The original intention of the software was always that judges should be required to have a monitor large enough to display the entire image at 100%. The practice of using zoom shortcuts was never supported, although the software is unable to totally control what users do.
But monitor sizes are hard to enforce, and we had several instances where judges did not have sufficiently large monitors, and did not realize they were not seeing the entire image. One aim with the new version was to give clear feedback in this case.
It sounds as if you must be requiring a specific browser, since these shortcut keys do not work in all browsers. (On my own system, they work in Firefox, but not in Chrome, in both the old and new versions.) Where the keys did work, there was always the risk that judges may attempt to zoom in too far, and see pixellation where there was none.
On the other hand, once we allow any downsizing at all, which in theory we did not before, it does make sense that we should at least allow zooming-in up to 100%. I’ll give some thought to adding a control to do that in the next release.