FWIW, Factorio downloaded an update this morning. Zoom still works, but is now limited to what appears to be in-game default limits. I tried a different infinite zoom mod, and same thing. Maybe factorio broke something?

As of 0.1.8 the behaviour of this mod has been reverted to how it worked before 0.1.5: it does not use the same hotkeys as the in-game zoom, but instead uses 'CTRL + K' and 'CTRL +L' (changeable in the control settings) for the infinite zooming.

If you're still having trouble let me know.