Hi Chris,
I can't say for sure as I've never tried that mod but it certainly does ring alarm bells in my head... I would try uninstalling that module and seeing whether or not you can configure the payment modules.
If that doesn't work then I'm afraid that, as Sarah has said, you've corrupted your installation somehow and a reinstall/fresh install might be the best way to recover.
Sorry I can't be of more help but your problem has nothing to do with the protx module itself.
All the best...
Conor
ceon
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