Can't save documents

I see some issues in your report. First is you have Avira Antivirus & CCleaner installed which is considered malware by most experienced users on these forums. Mac OS is catlike in that it cleans itself, Mac OS does not benefit from nor does it require any of the following types of third party apps:

·      Antivirus Apps

·      Cleaning Apps

·      Security Apps

·      VPN Apps

·      Maintenance Apps

What these types of apps do is the exact opposite of what users want. They make Mac OS slow, appear buggy, can damage Mac OS and sometimes create unwanted behaviors just like what you are experiencing! In short, they are really bad news!

So the first order of business for your computer is that you need to locate the developers. uninstall instructions for Avira AV & CCleanerr and please uninstall Avira & CCleaner. Because Avira & CCleaner are pretty nasty they tend to leave parts behind after being uninstalled, a testimony to how poorly written the apps are! To fully ensure you have uninstalled it please download the free version of FindAnyFile directly from the developer. Then have it search your system for the following:

• Avira
• Cleaner

Have it Trash any files with those names in them and then ensure the Trash is empty. 

Then restart in Safe Mode, with all wired peripherals (External Hard Disks, Printers, Scanners, etc..) disconnected and however with the keyboards charging cable plugged in so the keyboard appears as a wired keyboard. Then restart normally and test.

If the behavior. you are complaining about it still that that indicates that Avira & CCleaner has damaged Mac OS and you will need to install Mac OS in the Recovery Partition. However, before going to those lengths, please let us know so we can instruct you.

It will help us get a good idea of what is causing your problem if you provide a report of your system, that way we do not have to play 20 questions with you. The report we are requesting does NOT provide any personal information and is extremely safe to use. Please navigate to www.Etrecheck.com and download the free version of EtreCheck. Once you have you downloaded the app and installed it, please run the report and save it. This report will help us get a good idea what has been installed on your system and help us be able to diagnose what may be wrong.

When you have your report, you can attach it when you reply to this message and we can then review it and help you determine what is needed to get your system running well again. 

For instructions on how to download your EtreCheck report and attach it to your reply to this message please click How to use the Add Text Feature When Post… - Apple Community It is helpful to us if you download the report to your Desktop.

Your welcome, please don't forget to backup everything before doing an erase and install!