Hookmark 7 stops reacting

I installed Hookmark 7 but as soon as I call Hookmark and select an action (copy link, create new note, create new pdf) Hookmark stops reacting. I was able to create a new PDF with Hookmark but afterwards it stopped to work. I could not even active the application window with control-H or the menu item. I had to force quit Hookmark and restart it. But afterwards the problem happens again. I reinstalled Hookmark 6.13 and everything works fine again.

MacOS Tahoe 26.2