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If you are using MP over wireless, please try Ethernet to see if this resolves your issue. Also, make sure the EXACT same version and build of MP is installed on each machine (on the 'About' tab). You can get the most recent version from your account page

You may also want to completely remove the Secondary from the Primary grid and re-add it by IP instead:

Example:

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This is especially helpful when a VPN connection is used on any MP machine, Primary or Secondary.

Also, for 'jerky' mouse cursor movement on the Secondary, if either MP PC is under very heavy load (you can check task manager for CPU and Memory usage), this can affect how well MP can communicate mouse position and keyboard input to a Secondary. If the mouse and \ or keyboard are wireless, please try a wired versions as a test or at least ensure that they are both in close proximity to the base station for the device(s).

Also (and important), if the there are is a laptops \ tablets with issues, it is important that the power is plugged in as some network capabilities are selectively powered down on battery power.

If you are using WebRoot as an Anti-virus product, disable (remove is preferred) and try again. For reasons unknown, WR will prevent MP from working properly consistently.

If that all fails, try downloading the following file on each MP PC:

https://cdn.stardock.us/support/uploads/Purge_MP-New.zip

If you're on Vista/7/8/10, right click on the file and select "Run as administrator".

Example: