Hi Larry,
Thank you for uploading this project. Yes, there is a small and extremely weird bug that can be reproduced as follows:
1. Open a dynamic session on any image, such as DBE or DynamicPSF.
2. Create a process icon from the dynamic tool window.
3. Shade (minimize) the image.
4. Save a project.
5. Open the project saved in step 4.
6. Unshade (normalize) the image.
7. Open the icon saved in step 2.
At this point any keyboard commands, such as Delete to remove DBE samples, don't work during the dynamic session in step 7. This is a very strange problem, most likely a bug in Qt libraries. Fortunately, the workaround is very easy: instead of shading the image in step 3, iconize it. When the image is iconized and you open it in step 6, the bug does not happen and all keyboard commands work normally. Or just ignore the problem and live with this very small issue. Note that you still can delete DBE samples from the DBE window, by clicking the delete selected sample button (red cross icon). Similar equivalent buttons exist in other dynamic tools. Hopefully this will be solved in the next version.