Hi,
the zoom tool is apparently not working in Chromium browsers, at least for me. I tried it today on two different PCs (although with Ubuntu 12.04 running on both of them) and the following happened: clicking the small magnifying glass lets the drop down menu appear, but as soon as I click it it vanishes again. It works fine when I used Firefox on one of the machines.
By the way: keep up the good work, guys. This app is golden!
Cheers
Tobias
Edit: doh! Posted this on the wrong board.
Edit 2: doh again. Already reported over a month ago. Sorry.