Random "Invalid Parameter" Pop Up during Tagging

Anyone else experience the random "Error - Parameter Not Valid" pop up that appears sometimes when tagging?
Doesn't seem to be a specific cause, and the error message is less than helpful.

This is with the latest version 7.0.1.54

Running on Windows 10

It actually doesn't seem to just be during tagging

http://www.helions.co.uk/RMParameter.jpg

I get this occasionally using win 7 64 bit.I just close the box.Doesnt seem to affect anything.