Grid not showing buildings (graphics)

[juanito]

This happened to me today after clicking on the "city" button. Could be because my internet connection is crap right now, but usually I get at least some "pointers" (some white thingies) before the buildings appear that didn't even show up this time.

Attachments:

[Rasteroid]

was everything fine up until then?
do you remember what you were doing before that?
could you reproduce it, or was it ok after a refresh?