FYI...I just received this from Greenfield...

"As a valued partner, we are writing to inform you that on Sunday, March 23rd from 12:30pm to 3:30pm EST / 5:30pm to 8:30pm GMT, Toluna will be installing a major technical release upgrading our back office. Consequently, during this time, our back office and servers may be temporarily offline for a short period of time."