Does the MX980 have the same latency problems with used with a MRF260 or a MSC400? The 260 has it's RF receiver built into the case and the MSC400 uses the same antenna as the MRF350.

The reason I ask this is because the firmware in the remote may currently be written to insert a 500ms - 700ms delay after the button press to let the RF gateway of the base station open before it receives the command and then closes. If it is in the remote then the 260 will behave the same way when passing RF>IR and the MSC400 will behave the same way when receiving a trigger from the handset before executing the command.

The serial numbers indicate the manufacture date of any URC product:
Tweeterguy's sn is B620308 0002966 which indicates manufacturing code "B62" which is a 418mhz MX980 "0308" which is March 2008 build date and "0002966" which is the actual serial number in that batch.

Mitch57's sn is B580112 0100937 where B58 is either a 433mhz 980 OR a different hardware revision of the 418mhz because his manufacture date is January 2012, 4 years after Tweeterguy, and this could mean anything: different board components, new WinCE framework version, different factory.