I'm running Win10 upgraded OS. So far it seems that the paste function works the first time I use it in Explorer. After that if I select a file or folder and select 'copy', when I go to the target folder 'paste' is not available (greyed out). I have been able to shut down Explorer and restart it, then it will work once or twice before the paste function stops working. I'm assuming the copy, cut buffer is not dynamically clearing conditionally. Anyone else see this problem and have a solution?