VBO Crashes with TNT2

I am trying to use my VBO code w/ a TNT2 32MB which reports that it supports VBOs.
The same VBO code works fine under Geforce FX 5600 Ultra, Geforce II GTS.

The regular vertex array path works fine on all. The problem is with the VBO usage. Latest drivers.

I encounter two problems:

  1. Some models show visual problems, do not draw correctly, or at all.
  2. When deleting, and recreate vbo I get crashes.

ie
glDeleteBuffer
glGenBuffer
glCreateBuffer(size)
glMap
…add stuff
glUnMap
.

Any suggestions? Thanks.

Do you have a test case that reproduces this problem?