They're moving all their publisher's ads to a new system and they informed us it may take some time to finish. They still pay us on time.
I run their popunder and banners but don't know what happens to Gunggo since they migrated to new ad platform, one of my sites has 0 impression since 19/11/2012. Another site's impressions also drops since 2 days ago. My total earning also drops from average $3-4/day to yesterday $0.15/day with the ad tags installed and working, not much changes on my site's traffic but just my impressions and earning from Gunggo drops. Sent email to their support on this matter but no reply from them Hope to get their reply soon, or else will switch to other ad networks!