I'm already a Ph.D. starting my MD this summer/fall. I'm considering taking a research year between MS2/3 just too stay in touch with my field of research (and, of course, to keep those pubs coming). I've heard some comments/accounts that taking a break between MS2 & MS3 to do research (e.g., 2 years) can cause trouble for your MS3 year (clinical rotations) because you forget much of the MS1/2 material, which apparently is necessary for a successful MS3 year. If you took a break between MS2 & 3 to do one or more years of research, I would like to hear how prepared or unprepared you felt in your MS3 year. Was it a problem (even if temporary)?