I have had the same issue on AC 22 and AC 25. Read about possible ESET interference, uninstalled it and I was able to copy and paste again. Reinstalled ESET and still able to copy and paste. I have a suspicion that it might be ESET's Secure Browser Protection as I have had this activated before, have not activated again.
I have been experiencing this same problem intermittently since AC22. It appears that it is the "copy" function that fails (shortcut, right-click, or menu method: the text does not show up in the clipboard).
I do not use ESET, so that is not the culprit for me.
Copying / pasting objects works fine, copying and pasting entire text boxes works fine. Copying and pasting text in other programs works fine.
Copying and pasting text is a foundational functionality of software. I know that troubleshooting these problems can be complex. One thing is clear to me: AC that is the common denominator here. The problem is so unusual that it's almost humorous — instead it's annoying and debilitating.
A fix for this frustrating problem isn't much to ask for, in my opinion. As it is, the text box functionality is outdated, cumbersome, and would benefit from an overhaul. I think Graphisoft should stop blaming other software packages for this embarrassing issue and build a robust text-editing feature.
Eset may be just one program that is affecting the copy and/or paste commands.
There could well be other programs.
Maybe try turning everything else off so only Archicad is running.
Disconnect from the internet if you are worried about security while you test it.
It's astounding that so many background programs could cause this issue and it clearly is an issue but Graphisoft seem to not want to address it. It's like telling people not to use the kettle when you're watching the TV because it interferes with the reception.... Is that the TV's problem to fix or the kettle's?
I understand that it could be any number of things that cause the issue. However, no other software package I have ever used has been affected in this way. In my opinion, no software package should be so fragile that a basic function like copy / paste can be mysteriously disturbed so readily.
Archicad is powerful — it's a beast — but there is bound to be a lot of "technical debt" under the hood due to its age, legacy compatibility, plugins etc... I'm not surprised there are ghosts in the machine.
Considering the price tag, Archicad has a surprising number of "workarounds". Reading through the wishes forum, it appears that the user base has evolved beyond Archicad's functionality. It's time to go back to the drawing board, so to speak.