When this plugin is enabled and logging is set to $g_log_level = LOG_DATABASE, this plugin prevents users from adding any bug notes, MantisBT throws
APPLICATION ERROR #600 - Note not found.
The problem occurs in bugnote_add() function, which inserts a record in bugnote_text table, then tries to retrieve the new record's ID. Since the plugin has itself inserted a new record into the mantis_plugin_EventLog_events_table (due to the log_event() call in DbQuery::log_query() ), db_insert_id() call in bugnote_add() gets the ID of the the latter instead of bugnote_text's.
Not sure how this race condition can be fixed.
As a workaround, disable the plugin when LOG_DATABASE is enabled.