Also too, as I think was pointed out earlier... -There could have been a corrupted file or line written when the map was named that. Not deleting it before recompiling under the same name again would produce the error possibly. In other words, the naming convention is not itself the issue, but an incomplete file or part of a file under the same name won't re-write otherwise.
Maybe a clean-out of old compiles and/or other files referencing the old nonworking name could restore itself once re-compiling afterwards.
Not that I feel this is much of a concern now, since the error for all intents and purposes is fixed, but my enthusiasm to help investigate this issue seems to curtail my restraint from participating, as the GoldSource engine is not my field of experience but likewise, there are more similarities I find each time I follow a new Half-Life editing question. I certainly appreciate your willingness to investigate independently in part for us too!