Why does copy and paste sometimes stop working?
UltraEdit supports multiple clipboards and sometimes users have activated one of the user clipboards without being aware of doing so. The clipboards are activated from the Edit Menu, Right Click Menu or Ctrl+0 – Ctrl+9 with Ctrl+0 being the standard clipboard. The active clipboard is shown in the status bar following the line/col separated by a comma. C0 reflects the Windows Clipboard and C1-9 the user clipboards. If this is not the issue, then you may have enabled the setting to automatically copy selected text. Please go to Advanced -> Configuration -> Editor -> Miscellaneous and make sure that the option “Automatically copy to clipboard when selection is made” is unchecked.