gosmore shows no map

After starting gosmore, the gosmore.pak file is used, because I can search for places. But on the right site no map is shown.

I am running Ubuntu 8.04 on AMD 64 Hardware. I tried with different osm files and different gosmore versions (self compiled and Ubuntu). I get no error messages. If I start

strace gosmore

I can see the following error message:

 read(5, 0x62a044, 4096) = -1 EAGAIN (Resource temporarily unavailable)

Any ideas to get gosmore dispaying the map?