something wrong with user? numbers, pages, preview do not open

Hi comunity,

I am facing the following problem and have figured so far that it must be user related as it does not show up when signing in as guest user:

Numbers, pages, preview do not open anymore plus after restarting, the iMac always comes up with the same programs and windows no matter if I have closed them before shuttting the computer down and allthough they are NOT marked as 'open automatically upon starting'.

For example: safari always opens the same windows, allthough I have closed them and haven't used them. I have tried to empty the cache and to reset safari, but as soon as I restart the iMac safari comes up with the same old windows.

Only two things have happened that I could imagine being related with this:

* I have started working with iCloud for numbers and pages documents - unlikely I guess

* we have used a streaming service in order to stream TV program via the iMac onto our TV set - maybe that interferes with the iMac software?

* also once the iMac broke down and I had to force restart. Usually it simply starts with my user and settings, without me needing to sign in. But that time I had to sign in with my user name & password.

Hope you guys can help me with that. Guess by now you can tell that I am not an expert ;-)

Thanks a lot!