It's probably an old bug (and I will be shocked if it's fixed lol), but I am reporting it here since I am on the beta - Verbum/Mac, 9.8 Beta 3. Add a book, and where you type in the Description, type some text, while the cursor is still in the description box, click to another tab within the desktop app, then click back - the text is gone! If you click out of the description box before clicking on another tab the text is not lost.
I filmed it in a short video on my dropbox account so you can see it:
https://www.dropbox.com/s/i09ri0992fe6l50/PB-bug.mp4?dl=0