50% of time, when acknowledging a trigger after inserting message and clicking "Akcnowledge and return" we get the following:

<table class="msgerr" cellpadding="0" cellspacing="0"><tr class=""><td class="msg_main msg" id="page_msg"><strong class="">ERROR: Wrong RPC call to JS RPC!</strong></td></tr></table>

The message is generated on the line 42 of file jsrpc.php
The $_REQUEST array is empty.

Any ideas on how to debug this issue? We would love to help, but the complete lack of any development and architecture documentation this is practically impossible.