No problems, hopefully we get a solution soon.
Feel free to contact support if this is urgent as they will be able to help sooner 
Enterprise Manager will need a restart once you restarted the server to recreate the plugin.cfg so ensure you have done that, if that does not help I have attached a plugin.cfg, could you validate that what the generated one looks similar.
Could you also provide the fix level of UM Server and Enterprise Manager and I will try the same fix level?
Could you also lower the UM Server log level to 0/trace this is done via the config tab in EM “Logging Config” → fLoggerLevel see here for more information about configs https://techcommunity.softwareag.com/ecosystem/documentation/onlinehelp/Rohan/num10-1/10-1_UM_webhelp/index.html#page/um-webhelp%2Fto-realmcfg.html
Once you have lowered the log level, restart UM Server, restart EM ensure the issue is reproduced and collect the nirvana.log and plugin logs, from the following locations
INSTALL_LOCATION/UniversalMessaging/server/SERVER_INSTANCE_NAME/plugins/log/access.log
INSTALL_LOCATION/UniversalMessaging/server/SERVER_INSTANCE_NAME/plugins/log/error.log
INSTALL_LOCATION/UniversalMessaging/server/SERVER_INSTANCE_NAME/plugins/log/plugin.log
INSTALL_LOCATION/UniversalMessaging/server/SERVER_INSTANCE_NAME/data/nirvana.log
plugin.cfg.txt (357 Bytes)
#Universal-Messaging-Broker#webMethods#Integration-Server-and-ESB