David Christensen wrote: 
> Normally, I can cut and paste between Xfce desktop applications.
> 
> 
> Enter a Zip Code of "12345", highlight the first result, copy it to the
> clipboard, start Terminal, open a file with Vim, press "i" to enter insert
> mode, and paste, sometimes I see what I copied to the clipboard and
> sometimes I see nothing.
> 
> 
> I am unable to determine if the problem is Firefox, Vim, or something else.

Are you aware that there are at least three 'clipboards' here?

X11 primary selection: this usually get filled by selecting text
in a terminal. It usually gets pasted by Button 2. In vim, this
is the "+ buffer.

X11 clipboard: this usually gets filled by ctrl-c or
ctrl-shift-c or a menu "Copy". It usually gets pasted by ctrl-v
or ctrl-shift-v or a menu "Paste". In vim, this is the "*
buffer.

X11 secondary selection: you are unlikely to encounter it, but
when you do, it will be bizarre. Read: 
http://www.cs.man.ac.uk/~lindsec/secondary-selection.html

Vim can bypass a chunk of this by combining primary and
clipboard:

:set clipboard=unnamed,unnamedplus

in which case "* and "+ will be pasted simultaneously from vim.

-dsr-

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