Copy and paste lyrics

I'm using the latest version of Musescore. I've somehow lost the ability to copy lyrics from one voice and paste them into another (a very handy timesaver). I select the desired lyrics, hit command-c or Copy in the edit menu, then select the first note of the passage to which I want to add the copied lyrics, then command-v or Paste, but nothing happens. Might my score be corrupted? I imported it as a music xml file from Logic Pro, and I think I got a corrupted file notice when I first opened it, but not anytime since then.