Ran on two other computers -- looks like it's something on my end but I checked and the Sweave Global Settings are identical, RStudio versions are too. Both machines use MikTeX. Is there a way to clear RStudio? I just uninstalled, but when I reinstalled it still opened the R files I had open before the uninstall.
Update: I uninstalled again, I deleted the application data in
C:\Users\USER\AppData, and I reinstalled. It still doesn't work.