JTDX BLANK LINES

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Hello Graham,
  for future reference you do not need to uninstall JTDX to do a master reset, all of the settings are held in one file called JTDX.INI that is in a subfolder of the 'users' directory tree on the C: drive.

specifically here:  C:%HOMEPATH%\Appdata\local\jtdx      (please copy and paste that to the top bar of your Windows Explorer) in that folder you should see a file called JDTX.INI  Once JTDX has been closed, you can simply rename it to JTDX.OLD or JTDX.BAD or something like that, then when you start JTDX again it will be like day one, all settings will need to be entered again.

Good luck.

The same "trick" can be used to reset WSJT-X but look for the folder named WSJT-X under \Appdata\Local in lieu of JTDX, and the file to rename/delete is WSJT-X.INI