When I create PDFs in 1.2.1, the paper size is fixed as A4. I have tried resetting to letter in the Document properties, but it doesn't stick. This means when printing docs, content gets shrunk a bit.
When creating a doc, in the Advanced properties dialog area, it is set to "letter" but I still get A4 output.
Oddly, if I use a Custom size (set to 8.5" x 11"), I then get the correct size. So, there is a workaround.