Thanks....your suggestion fixed the text/image size on all of the application windows and the full expected appearance of my monitor screen. However, I do not know where the Print Dialog is located for the Canon printer or...is that part of the MacOS 10.5.8 operating system?
The 1920 x 1200 pixels is what I had set many many years ago and have NOT changed and indeed using 1920 x 1200 pixels returns me to my normal visual appearance of all my windows.
The interesting thing that after I fixed the resolution, I discovered that when I try to print on my Canon PIXMA iP4500 printer this operation still results in an error message descirbed in Item #3 in my original posting. Furthermore, at one time changed the resolution to 1280 x 960!!! Canon claims (perhaps in error) that the MacOS 10.5.8 operating system is responsible. Is that still possible? With this resolution, the monitor does not use the entire screen and all of the text and windows header and side bar get enlarged significantly or does ot fit in the entire screen.
Therefore, does anyone seen this problem or does anyone suggest that I (1) return to Canon to get more information (perhaps where I can find the Print Dialog setting that needs fixing) or (2) back to Apple to do more testing....or perhaps (3) replace the Canon printer with an HP printer. My wireless HP printer does not have this problem? I have already fixed permission and verified that my hard drive has no errors. This problem seems to be independent of the type of file that I attempt to print, .tiff, .pdf, .txt, .cvs, .rtf as after closing three error messages, then I can print and the printed image takes up 1/4 of the page and is located in left top corner!! However, testing that I did today, my 1280 x 1200 pixel resolution does not change back to 1280 x 960!!
It is interesting that it also took four discussions with Apple Support to tell me about the 1920 x 1200 pixel for this monitor. Guess they have forgotten how monitors were made in 2004. Still puzzled about the solution to Item #3.
LATER IN THE DAY...I called Canon to see what light they could shed on this problem and they said that the error message is relevant only if you are using an Epson Printer to print. Well, the last time I did that was when I had MacOS 10.4.11 on my system and before I upgraded to MacOS 10.5.8, but have not used an Epson printer previously, as I used such printer as a wireless printer at that time. Furthermore, the Print Dialog has become confused with the residual Epson printer driver such that the Canon printer now is using such in error. My Canon technical support person this afternoon said that the Print Dialog is part of MacOS and the Canon printer, using my old Epson driver functionality reported such as an error...as only the Epson printers report errors regarding "dpi". That information is very interesting and probably explains why this problem is so rare. There may be an update on the Epson printer driver that fixes this problem....but that is the next step to figure out.
I am now going to call Epson to see how I can un-install the old Epson Driver. After I have done that I will add another note for all to read, although I expect such does not happen frequently.
Thanks for your suggestion that solved Item #1 and Item #2.