I'm not on the new version yet but i've had all sorts of issues with SNMP alerts.  Anytime i've worked with support the usual fix is to change your SNMP settings and save them in OMEnt and then change them back to your defaults and save again.  Updates seem to cause OMEnt to lose the SNMP settings.
We recently updated OMEnterprise to v3.3.1, and now it is no longer receiving SNMP alerts from servers' iDRAC. We've rebooted the servers and the logs in their iDRAC reflect that, but OMEnterprise is not receiving them. I also tried sending test alerts from different iDRACs, no change. I know it's not on the iDRAC side because we've also got them sending to OMEssentials, and it is successfully receiving them. I've confirmed the SNMP settings are still present and correct.
After update to v3.3.1, OMEnterprise no longer receives SNMP alerts