Creating a module: Install/Unistall/Install gives strange error...

[rick]

I am creating a module.
The first-time install works without error, and the module functions without error.
However, when I uninstall the module, then attempt to install the module again, I get the following error:
"Unable to install module [module]: Role collision detected ([role]): role already exists."
The role was deleted successfully, and no reference to that name exists in the database.
Has anyone come across this before?