While I did not yet have my 3800 when I switched from LR 2.3 to LR 2.4 on Mac OS, I did not see any change in the prints I made. Now that I have the 3800, I don't notice any gross colour shifts or exposure shifts compared to the same work flow and papers. Hopefully this data point is of some use to you in determining if you have a specific issue or not.
Drew