After upgrading Client from 2.5 to 3.0.6, I am experiencing copy-paste problems especially between xpra child windows: Even with Copy-paste enabled in both directions it does not always work (mostly not). I am sorry not to be able to provide more information but perhaps this ticket helps to pay attention to possible causes.
What is your server version? Client OS? Server OS? Have you tried the python2 builds?
Client OS: Windows 10 Pro 1809 17763.973 Server OS: RHEL 7 XPra Server version: 2.5.3 1.r23270.el7_6
The problem occurred originally with Python3 build of the 3.0.6 client but now I switched to Python2 build of the 3.0.6 client and the same problem is there: With bi-directional clipboard enabled, copying from xpra child windows to Windows windows (sigh) is not working.
XPra Server version: 2.5.3 1.r23270.el7_6
That's well out of date, please try a supported version.
You may also have better luck with the latest beta for windows (https://xpra.org/beta/windows/) which includes some clipboard fixes.
Reported clipboard problems fixed by upgrading server side xpra to v3.0.6-r25195.
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2594