We're running Moodle 1.99 and having some serious woes at using zip or unzip functions.
When no system path to zip/unzip is in place Moodle doesn't seem to be using the PHP zipping library and any attempt to zip/unzip results in the following error:-
Which to me looks like it can't even find the correct error to display as that is just the name of the error variable?
When I put the correct system path in the the GNU zipping utilities (E:\bin\zip.exe) exactly the same error occurs.
When debugging is switched on there are no extra error messages, and we are really at a loss why this doesnt work as it is a problem we have never come across before.
If it helps the moodle server is running on Windows Server 2008.