Hello,
I can reproduce the following behaviour on Affinity Photo (1.8.3 on Mac).
Make some edit on a Tiff, with layers and save: Affinity will export the pictures and it can takes a little while if the file is big
while exporting, open a new file to Affinity using the Finder or Bridge.
-> Result, the new pictures will be loaded, but the export progress bar will never disappears and one has to "Force Quit" Affinity.
Can others reproduce this ?
Regards