When you mention 'clipboard', are you meaning the Copy/Paste functionality in Web Client, and if so, are you on an 18.2 version of Dynamics GP and Web Client?
The reason I ask is, we have found an issue with Web Client on the 18.2 version where copy/paste and the right-click commands do not work.
The issue is with the Web Client Runtime DLL files that are created during the install of Dynamics GP 18.2.
To work around this issue, what we’ve had customers do is either install Dynamics GP 2018 R2, if they don’t already have an instance of GP 18.0 R2, and install the ‘Web Client Runtime’ feature. This will put a folder in the GP 2018 R2 directory that is named ‘WebClient’.
Then, take a copy of the 'WebClient' folder from the Dynamics GP 2018 R2 directory and use it to replace the ‘WebClient’ directory from the 18.2 Dynamics GP directory that Web Client is pointed at and using, then log back into Web Client for Dynamics GP 18.2, which should resolve the copy/paste functionality issue, along with right-click processes within GP/Web Client.
This issue is scheduled to be resolved in the upcoming release this Fall, 2020.
Thanks