Hi, I have just updated to the 1.7.1 Mac OS X version on my iMac  -- Mojave 10.14.5 (18F132). Everything seemed to run very fluently and better the above version, but when I try to save the changes, Photos App doesn´t update the photos, so all the work done on Affinity Photo have no effect on the files... I hope this information was enough to solve this issue very soon.