TED 500 Data and Google PowerMeter don't match

It seems the data between being reported by my TED5000 and displayed in Google PowerMeter are not similar at all.

When I look at the TED data, it seems to be correct. The Google display for the same period has data missing for hours at a time and has "flat tops." For example, from July 25 2010, the Google display has no data for the period of June 25 from about 2pm-7pm and then at around 7pm-10pm there is a "flat top" reading 18 kW for the entire period. Maybe the gateway lost the ability to contact Google and the period of 7-10pm was buffered output??

I will give Google the benefit of the doubt as to the accuracy of the data they're reporting to me - in that it is an accurate representation of data it has been sent by my TED5000 (I am open to all possibilities, but I have not seen complaints that Google is misreporting data). That leaves me to suspect there's something wrong with the way my TED is reporting data TO Google. Is there any way to assess this function of my Gateway to make sure there are no communication errors?

I don't suspect it's line interference responsible for all the problems as the TED historical data contains data for the entire period (though the TED data reports a "flat top" from 2pm-8pm at 5.5 kWh). This is just wildly different that what Google is displaying.

Any other suggestions?