I am sorry you guys cannot help me. I have installed recent post widget and it works beautifully in the free generatepress, Astra, Twentyseventeen, and Kadence themes. Then when I activate GP Premium the pages load blank. I have done everything you have suggested as well as my own research and still when GP Premium is activated the blog pages load blank. I contacted my host and they cannot find why. One internet search suggested my host memory needs increased, I had my host increase memory and it did not fix the problem.
Because the blog pages load in other themes, I do not think it can be the fault of my computer as you suggested. Since the only variable is GP Premium can I load a fresh upgrade of it to see if it helps?