Your Hot Key window went blank. You can't see the spread sheet that is inside the Hot Key window. You can't make edit to the hotkeys. You know that your hotkey.htk is not corrupt. Please take a look at the screen shot that I have provided.
After an hour with the good lad from DAS Pro they come to the conclusion that it is a bug that will be resolved. It seem that the multiple monitor is the culprit. But for the mean time this is how you resolved the issue:
1. Move the Hot Key window to the main monitor of your multiple monitor setup and do your editing of the Hot Key from there. This is the most logical resolution for my purpose.
2. Under Scale and Layout in your Window's Display setting you want to change all the monitor that you have to the same number of percentage for the setting: Change the size of text, apps, and other items. But doing this affect my monitor resolution that is not conducive to a harmonious experience so I personally stay away from this solution.
This is what I got and what I learned. If you need detail instruction or help I might consider directly contacting DAS. I'm afraid I will not be able to help you much cause I am not an expert. I only post this because I have searched the forum and was not able to find a solution.