I use TeXShop on a Mac and keep updated with the latest version, which is currently 3.98. Sometimes when I open TeXShop, with windows from the previous session, one of the files opens twice and minimises to the dock. I am wondering if this has anything to do with the fact that the files are on Dropbox and there might be some syncing issue. Has this happened to anyone else?
MacOS Sierra 10.12.6 (16G1212)
MacBook Air (11-inch, Mid 2012)
2 GHz Intel Core i7 8 GB 1600 MHz DDR3