Hi Jan, sorry for the delayed response.
1. Mistika shows a warning message to save anytime that you´ve done changes and click on exit Mistika. This issue that you´ve descrived still happens? It happens everytime that you close Mistika?
2. I´ve already send your request to the Dev team. Anyway, I leave here the link where wspoke about to help other people that are reading this topic:
3. The comas and spaces are allowed in Mistika when importing. I´ve tried to import a file with the name that you´ve provided and I´ve been able to import it. Could you open a ticket sending us a file which Mistika can´t link due the name to test it deeper?
4. Thank you very much. I´ve added this as feature request!
As always, thank you very much Jan!
Cheers!
Carlos