Backend images won’t load

I have installed Spip 1.9.2b.

Install went perfect, only to find the private space won’t load some
interface images and this doesn’t look good.

Also i get very frecuent "403 Forbiden" messages at random times.

Sometimes a refresh fixes the problems.

I have happily used spip for years, on diferent host environments and I
won’t change it, but this time I’m getting crazy.

I tried today Spip 1.7 and it worked fine. No problems arrised. But I
desperately need the new features of the latest Spip.

I’m on a shared host.

Gracias, desde México.