After starting jEdit this morning, I got a pop-up window:

FTP Plugin Master Password
Enter the master password to decrypt your (s)FTP passwords:
[ empty text field ]
[OK] [Cancel]

The problem is that I never set such a password, though I did do a plugin update yesterday.

Clicking OK just brings up another dialog, cancelling brings up the 'Connect to Secure FTP Server' dialog and I can enter a password there, but then it pops up another dialog:

FTP Plugin Master Password
Choose a master password to enecrypt your new password file:
[ empty text field ]
[OK] [Cancel]

regardless of what I do, it just goes back to the first dialog, naturally, hidden underneath all other windows on the desktop.

Selecting cancel in the first dialog many, many, many times will eventually bring up a series of these dialogs and eventually starts up jEdit proper. However, there does not seem to be anywhere inside of jEdit configuration to set a master password. Changing the session results in a session to one with no remote files results in a session with no actual files loaded that cannot be used.

This makes jEdit effectively unusable.