Endless "Pasting From ..." Dialog

I'm trying to remote control an iMac running MacOS v11.4 from a MacBookPro running MacOS v11.2.3. Both are running TeamViewer v15.19.4. I am able to connect and see the iMac but the connection is extremely slow and a dialog box saying "Pasting from "MacBook Pro" " and "Connecting ..." (at the bottom of the box) keeps appearing and disappearing on the iMac. Within a few seconds the connection breaks but before it does I can usually see the iMac on the MacBookPro and occasionally even control it a bit.

I am able to connect the other way around (control the MacBookPro from the iMac) with no problem whatsoever. The Mac permissions and TeamViewer settings are identical on both. Both have a very fast internet connection with low latency. I am also able to connect to both with my iPhone though the connection to the iMac is very unstable.

There is no anti virus software on either computer.

Something must be wonked up on the iMac but I can't figure out what. Does anyone have any idea what might be going on ? Thanks in advance for your help!

Russ

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