I Had a cabin built with D logs !0 ” or so. finished in Nov 2006, the contractor took his time 17 Mos to finish the job (you get what you pay for) It wasent long until we had a blowing rain from a certain NW direction I think and water came in through the logs. Not always just the heavy blowing rains. I hired another contractor who came out and scaffolded the cabin 3 storys. removed windows reinstalled, permachinked all the joints, added some flashing and I still have water getting in when that
Not sure if you had the entire exterior caulked or chinked or just the butt joints and around windows. It should be caulked/chinked at every opening, between logs, at ends of all logs, at corners and around all doors and windows. If the gap is 3/4” or less I would recommend using Energy Seal, if larger then Perma Chink.