I’m getting the same issue with the error “Pasteboard inaccessible on remote machine” on 17.1.4.
I have 5 SUT, 2 pairs of Database and Application servers and 1 User access portal. I use the clipboard for reading back text fields to verify that text typed into the field by the script has done so 100% accurately and characters have not got lost/missed by the receiving OS. (use OCR I hear you mumble, not with this typeface and size, it just reads back garbage").
The clipboard function will initial start off working then after a few disconnects and reconnects to the SUTs from the script as it installs and configures the software under test, the clip board will just stop working with the stated error.
Rdpclip is still running, killing it and restarting it does no good.
The only thing that seems to work is rebooting the machines involved, ie the machine running eggplant functional and the SUT, and even then its not guaranteed to work on the first try.
I’m thinking of just opening all the SUT in an initial script and then just flick between them with out doing the disconnects.
I might also try going back a release or 2 of Eggplant Functional, but that then brings back other issues that 17.1.4 fixed.