The following are the steps I took to fix the problems I had. The main issue, for me, was the TN CRAN mirror site was not working. I listed the steps I took below to fix this problem, and then load Rcmdr and MASS.

> First change mirror on R console
> 1. Type chooseCRANmirror() on R console then hit enter

> 2. A dialog box will pull up-scroll to the bottom and choose httpmirrors then hit 'ok.'
> 3. Another dialog box will pull up-scroll to USA MO then choose 'ok.'
> 4. Now you will be back to the R console. Type install.packages("Rcmdr") then enter.
> At this point many things should start downloading on R console.
> 5. Once finished downloading type into R console library(Rcmdr) then enter. It may ask you at this point if you want to install multiple different things and select yes with everything.
> 6. Once finished downloading, R commander should come up. Go to tools then go to manage on mac OS X and turn off (recommended) nap app.
> 7. Now "X" out of R commander and "Don't save". Go back to R Console.
> 8. Type in install.packages("MASS") then enter.

> 9. It should say it downloaded and listed into a folder on your computer. At this point I would go ahead and "X" off the R console (and don't save the image or the work).

> At this point, I would get back on R commander just to check and see if everything is running. Due to the TN CRAN mirror site not working on mine or several other people's computers, you may have to change your CRAN mirror site by following steps 1-3 every time you log back on to R console (this may not be the case though). Once step 3 is finished, type in library(Rcmdr) [and this is the step you'll take every time you get on R console to get to Rcmdr]. After loading a couple things, Rcmdr should pull up.

Now to load MASS to the data sets in Rcmdr, minimize Rcmdr and go back to R console screen. Type in library(MASS) hit enter. Then pull minimized Rcmdr screen back up-go to Data then click on Data in packages then click Read data set from an attached package. A dialog box will pull up and the package MASS should be listed on the left side along with three other packages.

I just wanted to pass this along. I hope it helps.