post Installation - set up not working ?

Hello - ahead of having our IT dept. install a public facing version of XOT (released just this month) - I'm working form a local install on OSX (Xampp). That all seems to work fine, I'm able to get into localhost and create an LO. The issue I run into is when I go to export the LO as a ZIP - nothing happens . I click on the Get Deployment Zip - and nothing happens. When I preview the LO it works just fine:

https://www.evernote.com/l/AXP55qdMCD5Mt5ORftf7AjghIdRj1CQkUc4

Two posibilities come to mind:

1. A php error is generated (not enough memory, no zip plugin installed in php, or similar). Look in the apache error log or in the php error log for indications of this

2. You didn't publish the LO.

I don't recall installing a Zip plugin.. I just did the 'standard' xampp install. I'll have a look in the apache error log and php error log first. Thanks.

I got the following in the access log - nothing in the apache error log:

https://www.evernote.com/l/AXOoPNZQu2FMpKPtq6sTcyKWsdQ1GxP3pGU

And what is in the xampp/php/logs folder? Any errors there?

This is in the php_error_log:

[20-Nov-2015 19:01:27 Europe/Berlin] Failed to create zip : ,
[20-Nov-2015 19:06:19 Europe/Berlin] Failed to create zip : ,
[20-Nov-2015 19:12:25 Europe/Berlin] Failed to create zip : ,
[20-Nov-2015 19:12:46 Europe/Berlin] Failed to create zip : ,
[20-Nov-2015 19:12:52 Europe/Berlin] Failed to create zip : ,
[20-Nov-2015 20:18:45 Europe/Berlin] Failed to create zip : ,
[20-Nov-2015 20:18:47 Europe/Berlin] Failed to create zip : ,

I'm located in EST (United States).