Okay the one thing I have seen is that if the tool tried to download from the very begining (i.e. start=0) then fails much more then say its trying to catchup for the last couple of days. So It may help to import recent data and then try to download the rest and re-sync.
I have uploaded two files in this folder. one SCID and one exported txt file up until the last few minutes (Apr 14 2013 12:53 PST). Hope it helps.
https://www.dropbox.com/sh/cwy8hlg8yeyywtj/izpwnQBVrkthe time for the data is UTC format or is on your local pc time ?
If I remember right (it has been a long time since I set it up), they were in the exchange's local time (tho I think a couple converted to UTC)
You can adjust that in the individual graph's settings with an offset to your local time.
-- Smoov