Right mouse button response lag

i am using DraftSight 2020 x64 SP3. I am having an issue of the right mouse button "enter" function not being normally responsive when I have selected items with the left button. I often have to hit the right button 3 or 4 times to have it respond with the enter command. I have my right mouse button configured as "the same as hitting enter" under the "currently processed command" setting of user preferences ,mouse options (see attachment). Mouse gestures are disabled. I have the same problem with any of three different mice. I don't have this issues with any other software. I did not have this problem with the previous DraftSight version. any ideas?