Below is a video to help you understand what is happening: https://gfycat.com/GlamorousPopularAlligatorgar In the video, I demonstrate how if you attempt to select a payee with your mouse, the program crashes. I show that you can still select a payee with tab (or the up/down arrow key) but can't with the mouse. It is worth noting that when that final dialog pops up, whether I pick save or discard, it will still crash. It is also worth noting that if I click that little carrot to make a payee selection, that works fine without crashing.
This bug has already been documented and fixed in the upcoming update within 5.0.1 that should be released in the coming weeks. https://bugs.kde.org/show_bug.cgi?id=390264 The workaround is to use your keyboard and navigate the selection of the payee by using the up/down keys and then use the tab key to move forward. Using the mouse will cause the crash. Here's the fix. https://cgit.kde.org/kmymoney.git/commit/?id=7f63b5c02775ae7499f86cff46fef6b54bdb3a78 *** This bug has been marked as a duplicate of bug 390264 ***
Awesome! KDE community rocks. :)