An issue was found where the following error message would be logged in the WP log during the initialization phase:
U00003603 Program error: Client is not correctly supplied when calling ZULOGG.
Release : 21.0. 5, 21.0.6 and 21.0.7
Component : AUTOMATION ENGINE
Software Bug
The ZULOGG mentioned in the error is a part of a proprietary library that Automic uses. The library is the ZU00132 library and includes things like ZUHELP and ZULOGG which is used for logging functions. The message "Client is not correctly supplied when calling ZULOGG." is an internal debug message and can be ignored.
Issue determined as a defect to be fixed in future release of 21.0. There should be no impact to functionality.