(see attached image).

Nope. Perhaps try again.

I noticed that and have been trying on multiple occasions to upload since my original post and giving it upwards of one-half hour and still failing to upload two files (one at a time), both of which are less than 80KB. Needless to say, very frustrating, seeing the spiky rotating symbol.

Success, finally, one image uploaded.

Other image uploaded, have to keep them under 40 KB.

I really can not read the second image, are you uploading PNG files? They appear to work best in this forum. although Jpeg and Gif should also work.

Having said that, I can determine from the layout of the page that it is the Reminders part of calendar preferences. The only file referenced there is the sound file used to make a noise when the reminder pops up.

This defaults to Chrome://calendar/content/sound.wav.

So I really do not see anything that would indicate your calendar is anywhere, other than a CSV file and that may well be why you can not edit it..

Normally an Outlook exported CSV file would be imported using the "events and tasks" menu import option and the imported calendar should then be stored in a local SQLit database file. NOT a CSV and Not an ICS.

I cannot upload the image files for whatever reason (not for a lack of trying).

There was no importing or exporting of the calendars when this happened. I accidentally hit a very odd combination of function keys and other keys and shortly after when I tried to edit a calendar entry, it would not let me do that and then the other two problems showed up after I closed the program and tried again.

Further to Matt's comment that calendar information is stored in sqlite files, there are 21 files with "sqlite" in the file name in the [random number].default-release directory.

Which files or directories should I copy from my backups to restore the calendar data? I do keep three backups of my data (daily, weekly and near monthly (the near monthly one is stored off-site and is currently three weeks of age)), which I hope contains all the necessary calendar data files. I have not my weekly backups since this problem has occurred, so I am hoping it has the necessary current data.

Any guidance that can be provided is appreciated.

Problem solved:

Go to: View > Calendar > Calendar Pane > Calendar List - activate it (you may be surprised at how many calendars that were listed. I was. I had five listed).

The calendar I wanted to use was marked as locked. Right click on it, select Properties, uncheck the read only box. Everything was restored immediately.

Evidently, the entry under Edit > Calendar Properties was to another calendar. That was the calendar that had the settings that I referred to earlier in my post.

One additional note. Make sure you are in the Calendar tab when you try the foregoing, otherwise the Calendar entry under View will be greyed out.