Sorry for being curt, not my intention to express anger. What I meant was we have discussed this with the Hot Start developer, they are very aware of this issue, and I'm almost 100% certain the CL-650 is using the XPLM SDK in a perfectly acceptable and normal fashion. I am no such confidence in DataRefTool; it is well known to use "hacks" to do its job (I agree, the result is very useful!).