OpenStreetMap
I worked on the streets in SE London yesterday (giving names, tweaking errors) and now the area seems to be blank! It's not just purely blank, the areas (residential etc) are there, but the streets themselves are missing:
osm.org/?lat=51.3843&lon=-0.0417&zoom=14&layers=0B00FTF
(choose Osmarender)
Discussion
Comment from HannesHH on 20 October 2008 at 07:56
Don't worry, it is not your fault. There is a bug in the rendering sometimes. It will resolve itself somewhen. :)