Take a look at the network traffic with Fiddler or Firebug to see what the response is when you try to create the columns. There ought to be some clue there.
M.
p.s. I ran my test on WSS 3.0 because I had it handy. Let me know if you'd like me to test with SharePoint 2010.
M.
p.s. I ran my test on WSS 3.0 because I had it handy. Let me know if you'd like me to test with SharePoint 2010.