Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
   * What was the outcome of this action?
   * What outcome did you expect instead?

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I use x2go to individually access remotely running applications (Thunderbird, Eclipse, Vivaldi, ...) -- _not_ a whole desktop!
Since about two weeks to copy and paste directly from one of the remote applications to the other is more or less broken:
- copying puts an entry in the local clipboard applet as expected, but pasting freezes the receiving remote application for several seconds, and eventually only inserts a white space -- at the same time the local clipboard applet suddenly also contains an empty entry
- after the second or third attempty mostly it pastes without freezing
- as far as I can tell, there's no difference between simply selecting by highlighting or explicitly highlighting and using CTRL+C or "Copy" from the context menu

Workaround currently is to copy in the remote source application, paste into a local editor, copy into the remote target application.

Since I don't know what part (server or client) is responsible, and experiencing it on the client, I report against the client package.