[Tilesathome] missing tiles in osmarender layer.... but tiles exist on server

[Vilain Mamuth]

hi,

http://img380.imageshack.us/img380/73/missingtilesqe3.png

this is a capture of this url

http://www.informationfreeway.org/?lat=48.47151701084096&lon=1.4686396940093145&zoom=17&layers=B000F000F

this happens at any zoom level or any area of the world

you will see that tiles are missing, they are replaced by emptysea.png 
which seems to be the default for error loading images. but when i try 
to load the real url of a missing tile, it displays successfully

i tried to clear the cache a couple of time, request several rendering 
of this area, debug the website but no way....

moreover, it happens only for me at home, running an ubuntu box. i 
created a virtualbox with winXP, tested with IE and Firefox and there's 
no problem....

any idea of what can cause this pb?



Manu