We are currently experiencing a problem: the drop-down has no invocation tag at all.
(Our install is using Revive Adserver v3.1.0 running on nginx 1.4.6, PHP 5.3.3 and MySQL 5.1.73-log.)
screenshot: http://prntscr.com/77nu6b
This was a fresh install, not an upgrade. We have never used Revive/Openx before.
(I realize there is an update available: v3.2, however this will unlikely fix the issue, as it has it's own bug, also to do with the invocation tag.
That bug is noted here on GitHub)
We have tried re-installing from scratch, to no avail.
Any help is greatly appreciated.