When I opened my spreadsheet this morning I was greeted with what I believe to be a sign in screen.
I entered my name and initials and from there it went to selecting a language. Something to do with Zimbabwae.
By now I was sure I made some bad choices and tried to get out, but too late. The program opened in Writer.
I took a screenshot of what appeared and closed the file.
I'm sure it's the User Profile but now i have corrupted that I believe.
I did successfully load and run a different small previously created calc file with no problems.
At that point I went into Tools,Options and Tools, Customize and found the correct language, etc. and set it to English US I believe it was.
I have also created a new calc file with no problems.
Geez, I hope it is not to late to fix..... please help....

I'm not anxious to open my calc file again until I listen to your advise.
I did look at the USER file and sure enough, it was timestamped this morning at my opening experence. Shucks.
The screenshot is type png and about 70k if you want it i'll be glad to load.
The calc file is about 1.2mg.