Jeremy, I'm unable to "paste" the key into WF on my MacPro since there's no drop-down menu, and right-clicking doesn't work. However, I've typed the keys into WF Anywhere and they work fine. The problem I'm having with WF Pro is apparently related to language code confusion, not API keys. At this point, I've tried various things in WF Pro: clarifying codes as EN-US to ES-MX in preferences as well as finding/replacing them in previous WF Classic files; opening new projects and creating new files and TMs from scratch with those language descriptors; and trying to use old Classic files in various ways--but all to no avail. At one pt, I had an error msg related to a faulty header, but it is correct now. . . . I'm not sure about your "billing" thoughts but don't think that's the issue. I think my MT problems stem from conflicting language codes, which I've tried to identify and correct--as well as to use/create new projects and files with the correct language codes.
Joao, here are the continuing error messages for Google and MS in WF Pro:
"Couldn't detect if languages are supported. Server message: Error while parsing list of supported languages. Please note that Google MT will not be used." AND
"Couldn't detect if languages are supported. Server message: ACS50012: Authentication failed. Trace ID . . . . Please note that Microsoft MT will not be used."
FYI, I have the newest WF Pro version and a MacBook Pro with the newest update of Mountain Lion OS.
Thanks in advance for any help/suggestions. BTW, I apologize for not getting back sooner. I had been posting on proz.com (see "johndel" in "Wordfast Support" forum.