I found a problem. And as it turned out, it is not related to the resolution of the logo. I studied the question in more detail and found out that if there are Russian letters (Cyrillic) in the logo’s name in the logo folder, the game refuses to load. Those. I launched the game, chose as the logo, the name of which has Cyrillic, I saved everything. More this saving will not be able to load. Then I did the same thing, but with the logo, in the title of which, there are only English letters. And the game is quietly loading.
Logos are the same. Only the inscription on the logo itself is different (to distinguish one from the other in the game for testing). They also differ in name. One is called in Russian, the other in English.
All logos operations were made in the editor and the same source file was edited.
I also tested a lot of resolutions and formats. I had for testing the resolution: 450 * 450, 512 * 512, 550 * 550, 548 * 550, 718 * 777. All saves with these logos could be loaded. All names were in their numbers corresponding to the resolution. This is so that after changing the resolution of the logo in the editor, it is possible to distinguish them.
I did the same for the rest of the file formats. The game does not accept any format except .png.
Under the link there are 2 saves and 2 logos. Save save_005.xml corresponds to the logo with the name "English1". Accordingly, saving save_006.xml corresponds to the file with the name "Русский".
Saving "005" is loading. Saving "006" - no. The reason is described above.
https://yadi.sk/d/pjCerJ7n72yjzQ