This is just a quick pick:

- The mouse pointer disappears and stays hidden
- Copying from the editor field does not work
- Marking of segments does not work
- Confirming a segment status is arbitrary, sometimes it works, sometimes not, sometimes is miraculously changed into something else again
- Check document (F8). Errors are displayed but cannot be marked/used. This tool used to be antiquated anyway. Now its useless.

Hello Maria Leverenz ,

Could you please let us know what operating system you are using and whether you are using PC or MAC and the actual version of Studio (Help- About SDL Trados Studio)

To try and resolve these issues, I would first suggest ensuring everything is up to date.

We have the following Wikis (Part 1 and Part 2) that should help guide you through the process (including operating system/ drivers etc.)

https://community.sdl.com/product-groups/translationproductivity/w/customer-experience/3392/how-to-part-1-trouble-shoot-unexplained-errors-and-unwanted-behaviour-in-studio-multiterm

https://community.sdl.com/product-groups/translationproductivity/w/customer-experience/3393/how-to-part-2-trouble-shoot-unexplained-errors-and-unwanted-behavior-in-studio-multiterm

It appears that at least some of these issues are possibly connected to the mouse itself.

Are you able to use a different mouse/ connect via a different USB port?

A detailed explanation (and screenshots/recordings where possible) of exactly when these issues arise would be helpful as I simply cannot reproduce these and i haven't seen others report this behaviour 

PC, windows 10, mouse belongs to laptop works fine

and no, I do not have the time to read any wikis, whatever. if I buy a program I expect it to work.

2019 did not did not work alongside with 2021. Unistalled 2021 and 2019. Reinstalled 2019. And thankfully now it works. Even the mouse. So much for 2021.

2019 did not did not work alongside with 2021. Unistalled 2021 and 2019. Reinstalled 2019. And thankfully now it works. Even the mouse. So much for 2021.