Well I'm using the windows binaries but in ver .22 I don't see the -1 optiong although the -k option (keep going) is there.  If I specify an output file and no other options, it terminates after one match.  In the version I use which I got here - http://lifeboat.com/ex/press.releases.bitcoins.hundred.thousand.dollars (link to vanitygen in the text) the -1 and the -k options exist and it you don't specify the -1 option it still stops after the first match. This is a windows binary as well.

 

 There's a first time for everything

I've used cross compile to generate the Windows binaries from Ubuntu.
This seems to work for keyconv, I'm still struggling with vanitygen itself.
I've put the binary in my repo at github, but since github doesn't support single file download,
the whole repo needs to be downloaded as zip.

This version of keyconv has the -X switch to support multiple cryptocoins.
It also supports combining compressed WIF format keys.

EPIC! Thank you, very handy already downloaded it, but I don't have access to my Windows machine right now, so I'll report back later about it

I checked the Lifeboat's download, but that one does not contain the keyconv utility.
I therefor mean my own version of keyconv . @ https://github.com/kangaderoo/vanitygen

The way it's setup is that it only combines WIF key's.
Not the ECSDA private key's.

The case-insensitive option unrolls the word into every possibility, so a word like

1siik

would become

1siik
1Siik
1siiK
1SiiK

A normal four-letter (without special characters like "i" which don't have an uppercase in Base58) would become sixteen possibilities; a six-letter would become 64 possibilities. If you have 512 eight-character words, it is actually a list of 128k words after all permutations, which becomes 1 megabyte.

The final list is also pre-processed to remove redundant matches (like your list has 1siik and 1siikfo) and invalid/too long strings. CPU vanitygen uses 2GB on my system while just processing a huge list of 8-14 character words, and dies about line 82K before it even starts generating, probably from running out of 32-bit process memory.

Even if you were to compile in 64 bit, you will likely hit GPU RAM limits, if that's not already your limiting factor.

 run vanitygen with just the -h option and nothing else.  It will give you the version information first followed by a list of valid options.  If the -1 option is not there, you wont be able to use it.

 I just ran the lifeboat version with the command-line "oclvanitygen -D 0:0 -1 1Nasty" and I got this -

Pattern: 1Nasty
Address: 1NastyC4VZLhJnFW2oQy1ck2kkNYDNZ1N4
Privkey: 5J79D1XgDc1meLoGhCCPAFSsBfHAw1ycTba7nL75pJDVrCw12Kz

in about 30 seconds and the program terminated normally afterward.

I've never came across this before, Need to create myself an address!

 It is very secure.  If your computer is not secure however, then the addresses you generate will not be secure.
Also, if you export the private keys to an online wallet, you are potentially compromising the security of those addresses.
So the program is fine but the security issues arise when dealing with the key pairs you generate.