It looks like all of the auto-resizeable columns got turned off, which can make a bit of a mess.
There are a several ways to solve this:
1) Turn on all the columns in the customize menu. After you hit OK, you still won't see any columns, but grab the very right-hand edge of the "Hop" column header and drag it left. You should see the additional columns appear. Then, resize everything appropriately.
*OR*
2) Close PingPlotter. Open the "C:\Users\(your user name)\AppData\Roaming\PingPlotter\PingPlotter.INI" in your favorite text editor (could be Notepad). Scroll down until you see the [Columns] section. Delete the "VisibleWidth=" line completely. Save the changes. Re-open PingPlotter.
*OR*
3) Close PingPlotter. Delete your "C:\Users\(your user name)\AppData\Roaming\PingPlotter\PingPlotter.INI" file - this will delete all your settings. Re-open PingPlotter.
If none of this gets you going, please let us know.