Cant think of an answer why, Brian, I am sure there will be one just i cant thnk of it. To auto-populate it has to be on either myflights or the network at the time you click on it and it can take up to around a minute on occasions to populate dependant on things such a how busy is the server etc.
If you try to populate in Mylog and it is in myflights at that time it wont populate until it leaves myflights.
Alan