Hi Andria,
It will not be long before there is a new release available. This is just a case of the documentation getting a little ahead of the release because I try to document things as I make changes so that I don't forget about the changes when I do make the release.
I'm almost always running newer builds of mojoPortal here and on our demo site in order to try and shake out any bugs before making a new release.
I'm not sure about the errors you got when updating skins, maybe some file system permissions got funky or something.
When there are changes to the skins, I always maintain the skins under /Data/skins with each release and it should not be a problem after upgrading to copy the skins from /Data/skins to /Data/Sites/[SiteID]/skins if you want the latest versions of included skins in your site. It is always a good idea to use custom names for your own skins so that the included ones would not overwrite them if you do copy them into your site specific skin folder.
And you should always be able to update your custom skins according to the notes in our sticky thread after upgrading.
Best,
Joe