If you, like me, have been dealing with Lightroom 6+ not launching the import dialog box when you insert a memory card even though you have made sure all the correct options have been checked then you are in luck. The issue apparently is with the registry, because my issue started when Adobe changed the import dialog box during one of the updates. Even after the next update, Lightroom wouldnt launch when I inserted my memory card. A uninstall/re-install didnt resolve the issue, so I started comparing between my 2 pc’s. I noticed that there were numerous registry entries that were different between the 2, as the desktop still acted correctly. Once I removed some older entries from the desktop relating to LR3/4, the same issue surfaced. So today, I downloaded a registry finder to help cleanup the registry from old Lightroom entries. A finder is a bit different then a cleaner as you can specify what you are looking for v’s simply having the software check for old entries/issues etc. Lightroom is one of those programs that doesn’t cleanup after itself if you uninstall it or update it. After one more uninstall, I ran the registry finder, and looked for Lightroom entries, it found close to 300 orphaned entries that can affect a new LR installation. I removed all the entries, re-installed LR6, made sure that the correct options were selected under preferences and closed LR.
Upon memory card insertion, my Win10 system asked me what I wanted to do with the images (so far so good), I selected LR and nothing happened. Okay, I know LR is up to 6.4, so I grabbed the update and installed it. Once I started the software, I made sure to check the preferences, and guess what, the Show Import Dialog When A Memory Card is Detected, was unselected. So make sure you check that after the update. Anyway, I shut down LR, and inserted my memory card, and YES, the import dialog box started like it used to. Now, I just have to redo my desktop installation.