Thank-you for the quick replies. I've already answered one of my questions. I plugged the receiver to do a data upload and it simply appended the currently displayed data points to the pre-existing ones.The data line is much smoother and is within two points of a my fingerstick.
This receiver is about one year old but has otherwise performed well. Andy, I hope this doesn't mean my receiver is about to die. I'll wait and see. I have a new one in reserve.
John - Thanks for the cut and paste from the manual. I should have checked there first but it doesn't offer much info. I'm still waiting for the Dex return call.
wilne - It's good to know others have experienced this, too. Do you have the 505 update, also?
Clare - Thanks for the reminder about the hard reset. I don't feel I need the old data on my screen. I'm happy it's all in the Studio program. Plus I have a screen with a nice flat two-hour line 93-101. Looks pretty!