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There is no "real time" checkbox under the date and time boxes. You use Real Time , when you don't have selected Enter time manually . Would lack of CAT control explain these issues? Since we do not know anything about your hardware setup and your CAT settings, you can't expect an useful ...

It seems your CAT control is not working properly.

Set the logbook time to real time clock. There is a popup menu below the date read out.

First at all make sure you really need this driver. Do you use a Yaesu with two virtual ports? The latest driver from the SiLabs page will work.

The full Country name is not in the logbook and can't be shown in this table.
The translation may not be correct. Страна stands here for an US-County.
Note: When you save a QSO direct from WSJT-X data from qrz.com will to be used.

Are you talking about your own presets in the combobox popup menu?
Then you are right. These values are stored locally. It could be make more sense to save it in the logbook file.

Where can I find 5.17.1 ?

https://dl2rum.de/RUMlogNG/RUMlogNG.zip

Please try this for a short test and report back: https://dl2rum.de/RUMlogNG/RUMlogNG_Test.zip Do you use the iCloud synced logbook? Please drag and drop the crash log out of Console. Do not copy & paste the text. Please send it via e-mail. There are few known problems with 5.18. You can reload ...

Finally fixed. It seems the problem was a failure in the file system. Deleting sandbox container ~/Library/Containers/de.dl2rum.RUMlogNG solved the problem.

But aside from that caveat, is that the only file to move between folders?

Yes, just move the database file. All logbook related settings are within this database. These settings are marked in the Preferences.