Mouse cursor problem when external display connected

When my external Apple display is connected to my MacBook Pro (Retina, Mid 2012, 10.10.2) the cursor jumps to a spot on the external display and will not release from it. I move the cursor anywhere and it jumps back to that original spot. Cursor operates normally when the external monitor is not attached. I've used the monitor for a few years with no problem, but this started just recently. I do not use the external monitor daily and I cannot recall doing anything that might have triggered this problem. Any ideas on a fix? Thanks.

Just an update to close this. Call Apple Support. An advanced support tech walked me through several procedures. Eventually, the problem disappeared after deleting a bunch of plist files and startup items. Which particular file caused the problem we don't know. But problem gone and I will monitor going forward. Hopefully it was a one-time corruption of one of the preference files.

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