Okay, thank you Bruce!
This is what I did today, with a much fresher mind, and after running Disk Utility on my hard drive. Still have to connect the external hard drive and do a Time Machine back-up. Yes, I will do that later today, before I do anything else major.
I started up my husband’s MacBook Air (he passed, so I haven’t accessed it much in the past two years).
I was able to connect it to my iMac via our network and already had Panorama X installed. I pulled the database file from my iMac to the MacBook and voila! it opened when I accessed Data Sheet, so all isn’t lost.
I did try the file first on the iMac today, and what opens is just a blank procedure window. (the procedure is to do a running total). Choosing Data Sheet adds another blank window.
The only thing I did differently two days ago was to install the recent iTunes update. Is there any way to uninstall it?
Thank you for your help. Is there anyone on this forum who provides Panorama X user lessons, that could be with my files and my needs in mind? Though I am a long time user, I am not a programmer. My needs for Panorama are a simple database in which each year I add entries in each file for a specialty (one breed) dog shows. This information is then re-formatted and exported to a QuarkXpress file of the catalog that is printed and used at the dog show. The Panorama file is also used for the data information regarding the dogs . . . name, AKC number, birthdate, breeder, owner, address, etc. and classes entered. Simple, but it has worked for me for almost 40 years. Overvue/Panorama is an integral step in the process. I will have to retire if I can’t make this work in Panorama X.