Issues, Workarounds & Localization

As above, I've updated with today's patch (on 4 clients btw, only the one for this character is having an issue) and am unable to continue past the character select screen.

The error message I'm seeing is "Connection Lost - An unexpected error has occurred"

Log contents as follows:

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Gamelog
Session Started: 2015.12.10 13:50:11

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[ 2015.12.10 13:50:42 ] (info) The transport has not yet been connected, or authentication was not successful.

Any thoughts? I've updated 3 other clients on the same machine and logged in those accounts without issue, and I've also run the repair tool on this client.

3 possibilities :
random network issues (possible, but not likely, and absolutely no way to test, and no, using YouTube as a reference is not a valid argument, I don't discuss this issue.)
data corruption due to patch (most likely culprit)
account issue on server

(I don't know of other obvious usual suspect)

you can't do anything about network, except if you use wifi, don't.

you can try checkin for corruption
1 clear cache in game : ESC, Reset Settings, Clear all cache files, exit relog.
2 run RESCACHE.exe (small program located in eve folder)
(alternatively use the beta launcher and use the graphical option "verify" in the settings/general/sharedcache option)

when you get there (if you get there : network issue can affect step 2, fun fun fun) and the problem still is present, you have usually only one course of action :
Open a ticket in the support web site. only a gm can help you