Have mapped webdav in Windows Vista SP1.
Total Commander (file manager) works well with all the operations, but Windows not.
If we try to drag'n'drop any item to the mapped drive, then select "Copy Here" - it causes an error.
It seems, that Windows buffer work causes the problem - if we try to Ctrl-C, then Ctrl-V in the Total Commander, or Ctrl-X, then Ctrl-V - it also leads to an error,
Otherwise, F5 (copy) and F6 (move) works well.