ROAuth and twitteR, Mac OS X 10.7, R 2.15
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I'm having a very difficult time getting my OAuth to work so that I can make 350 calls per hour to twitter's API.

I have reviewed several other threads with similar topics, but my problem appears to be different:

http://stackoverflow.com/questions/5589522/twitter-and-roauth-r-packages-install

http://stackoverflow.com/questions/9373157/twitter-and-roauth

http://stackoverflow.com/questions/9916283/twitter-roauth-and-windows-register-ok-but-certificate-verify-failed

my code is as follows:

        rm(list=ls())
        library("twitteR")
        library("ROAuth")
        requestURL <- "https://api.twitter.com/oauth/request_token"
        accessURL = "https://api.twitter.com/oauth/access_token"
        authURL = "https://api.twitter.com/oauth/authorize"
        cKey = "__________"
        cSecret = "__________"
        Cred <- OAuthFactory$new(consumerKey=cKey,
					consumerSecret=cSecret,
					requestURL=requestURL,
					accessURL=accessURL,
					authURL=authURL)
        Cred$handshake()
        registerTwitterOAuth(Cred)

Despite trying many different versions of the same code, resetting my API key, and even registering a new account and retrieiving a new API key, i continually return this error:

        Error in Cred$handshake() : 
        Invalid response from site, please check your consumerKey and consumerSecret and try again.

There is absolutely no way this could be an issue with my key/secret. Any other ideas?