OEOmega will no longer cause non-deterministic amounts of superfluous messages to be thrown to OESystem_OEThrow when running in multiple threads. This had been happening because OEOmega calls OEErrorHandler.SetLevel to selectively silence warning messages it knows to be benign. This was fixed by only allowing the OEErrorHandler.SetLevel method to change the error level for the current thread, using an OEThreadLocal object to control message visibility.
See also
The OpenEye GitHub account contains an example of a multi-threaded OMEGA implementation.