Export to pdf works server side, but not via AccessPoint
This will probably only work from the IE Plugin since print macros are notoriously unreliable in Java and AJAX. Have you tried it from the IE Plugin? Also make sure that in QEMC --> System --> QlikView Servers --> Security tab, "Allow Macro Execution on Server" is enabled. For experimentation, you can try checking the "Allow Unsafe Macro Execution on Server" and see if the problem is resolved.