In the settings I created a profile, and in it I selected all the paired hosts I have.
When I select a folder with 49 files to upload in the queue list, I see only a portion (The first 12 hosts marked in profile).
Before selecting upload everything was fine. I didn't see any negative message and the settings remained unchanged also after restarting the program.
The moment I select files to upload and they appear in the queue, when I go into the same profile, then only the first 1/4 part of the hosts I selected is there selected.
It looks like the profile can handle a limited number of hosts, but I haven't seen any mention of this anywhere.