Tony Leistone

in the uv/image editor, display the texture you want to remove, hold shift, then click the X to unlink the image datablock, in the dropdown browse images, zero will appear in front of the texture it only works on one texture at a time, dont display again the texture to be deleted, in the uv/image editor window. just save, close and reopen yes it is inconvenient, but for now that seems to be the only way.

hold shift, then hit X, zero will appear in front of your texture, save your blend file, and reopen and its gone.

i also have had problems uploading mesh at times, only advice i can give is only use the sl linden lab viewer for uploading mesh, i've had problems with firestorm viewer not uploading correctly, i have not tried the latest releases of firestorm, make sure you unwrap your mesh and also for multi mesh uploads, make sure to rename each uvmap a different name, uvmap1, uvmap2, etc before uploading, i've had error messages when i try to use the same complicated mesh as my physics shape, but if i use a simple physics shape with alot less vertices, it seems to upload with no problems, dont know why this happens