Not much interest in this thread.  Guess it's too obvious to most people.  Still seems to me it isn't a good idea to do too much monitor resolution switching, but I'll research that more elsewhere.  
At any rate, Aces High bulletin board was slow to load and show after I switched to 1280x1024 flying while keeping my overall resolution at 1024x768.  
So I switched back to 1024x768 for flying and bulletin board and all is smooth again.  
However, I still fly FS2004 in 1280x1024 and naturally enjoy the prettier graphics.   
Thanks for your input, Davenrino.  I once increased my font size but found it was screwing up scrolling and presentation in some programs.  Always a compatibility issue somewhere, I suppose.