I drove myself a little batty with a large build I was working on at InWorldz, where the floor textures would not line up correctly no matter what I tried, and because I was building with the floor set to bumpy+shiny under deferred rendering, it stuck out like a sore thumb. So, after doing some investigating, I found that there appears to be a problem under Cool VL Viewer with the rotations of planar textures.
Here is a close up picture of where two prim surfaces meet, taken under
Imprudence. The textures line up seamlessly and correctly:
And here is another close up that same section, this time under
Cool VL Viewer:
Here's a snapshot of another copy of the same build, where the rotation problem is even worse (despite them being identical) and it becomes more invisible with bump+shiny under deferred rendering:
A friend of mine, who is running revision 1410 of the Phoenix Viewer reports seeing the same thing I was. In Imprudence it works fine, so not sure what's causing it.
Henri, at InWorldz I've sent you a copy of a build that reproduces the issue. The object name is "Texture Problem Example". Also, it's rather large (192x80 footprint)
Here's a copy&paste of the viewer info: