Hi folks, I have been working through the new E1.31 extensions, in the new standard which is likely to come out in the next month or do. Some current systems ( they will remain nameless becuase this is not a name and shame ) will have issues and testing shows that some will glitch if they get E1.31 extended packets. ( the sync packet or a discovery packet ). The E1.31 standard mandates that systems *should* check the various feilds in the headers. Some systems don't and they appear to process "extended" packets as data packets and the results vary from a lock up to a glitch. 2 vendors systems appeared ok. ( these are DIY Christmas common controllers ). I would urge you to ask your vendor if they are actually standards compliant ( now ). for vendors, please check the new draft standard, its all public. At a minimum you need to check the root vector feild and discard anthing apart from data packets, and you *should* be ok. I'd urge you however to probably spent a little more time and check all the feilds that are importnat.