Mysterious `keybase pull` error

On all computers except for the one where I pushed my private key from, when I run keybase pull (or any other keybase command tries to pull the private key), I get this error message:

```
Your keybase login passphrase (to pull your private key from the server):
- run scrypt [==================================] 100%
error: Signature mismatch or bad decryption key
```

At first I thought that this was a problem with the password I was entering, but I was able to verify the password by doing a `reset` and then subsequent `login` with the same password copied and pasted. So is this a problem with my particular setup or something else?

I uploaded the key originally from a Linux Mint machine:

```
keybase (keybase.io CLI) v0.4.4
- node.js v0.10.26
- gpg (GnuPG) 1.4.12
- Copyright (C) 2012 Free Software Foundation, Inc.
Identifies as: 'keybase.io node.js client v0.4.4 linux'
```

And I've tried (unsuccessfully) to pull it down on both a mac and linux machine:

```
keybase (keybase.io CLI) v0.4.4
- node.js v0.10.26
- gpg (GnuPG/MacGPG2) 2.0.22
- libgcrypt 1.5.3
Identifies as: 'keybase.io node.js client v0.4.4 darwin'

keybase (keybase.io CLI) v0.4.4
- node.js v0.10.25
- gpg (GnuPG) 1.4.14
- Copyright (C) 2013 Free Software Foundation, Inc.
Identifies as: 'keybase.io node.js client v0.4.4 linux'
```

Reproduce the failure with keybase pull, then compare the reported Linux and macOS environments, including their Node.js, GnuPG, and libgcrypt versions. Use reset and login to verify the passphrase separately; done means identifying the cause of the signature mismatch and confirming that private-key retrieval works across the reported platforms.

Written by the indexing model from the issue text.