Unable to checkout working tree from branch

[DeeJay]

I have a standalone branch from which I am unable to recreate its working tree.

With bzr 0.91 the error message is "ERROR: Unable to delete transform
temporary directory"

With bzr 0.90 the error message is "ERROR: [Error 183] Cannot create a
file when that file already exists"

"bzr check" finds no errors in the branch.

My premise is that if I 'COMMIT' files and change history to an RCS
then I should be able to subsequently 'CHECKOUT' those files and
regenerate the working tree and its history. Is anyone interested in
looking at this branch to see why this expectation is not being met?

[I am fairly certain that the 'corruption' is due to two filenames
which differ only in case, but the commit was accepted several
revisions ago and I have no idea how to unravel the situation.]