I haven't noticed anyone mention the zoom problem before, so I don't know if there's an answer. As a workaround, could you define alternate keyboard shortcuts? (Sounds absurd, I know, but I use the zoom in the corner, myself. Also, I'm on Windows, so I can't duplicate the problem for you.)
As for the export problem, Adobe acknowledges it. The workaround is to click on the canvas (somewhere in the image) before going to export, not just on the tab.
(The response there is by Sarthak Singhal of Adobe.)
Thanks for the suggestion.
I have found that clicking on the photo works on export, but not all of the time.
I tried redefining a keyboard shortcut. That does not work since the "Menu: View/Zoom In" function does not work either.
Strange that it is only a problem with multiple photos open and they appear in tabs. I have tried deselecting "Open new documents as tabs" under preferences. That 'fixes' the problem since the zoom in / out does not work only with multiple tabs open, but it works with multiple windows open. I suspect that this 'fix' will work on the export problem too, since I will be exporting the active window.
So essentially, the 'open new documents as tabs' is so buggy that it should not be used.
Hopefully Adobe will not try to charge me for an upgrade to CS5 in order to fix this problem.
Yes, Mac people have had trouble with the tabs in other areas, too, I'm afraid.
If you want, you could file a bug with Adobe about the zoom not working for you. Here's the feature request/bug report form:
I used the bug report form to submit the problem.
In the meantime, I have gone to preferences and have selected files to open as separate windows. This also makes Image Preview (Export) work properly, too.
I appreciate your help.
Glad to help! (Or try to.)
It's good to know that changing the preference to "open files as separate windows" is a work around for both problems. I'll try to remember that if someone else posts the same problem. Thanks!