Gamers.IRC doesn't automatically register with NickServ in the freenode.net network anymore. This is due a NickServ update by their staff.
Solution:
Open the mIRC script editor (Alt+R) with gamersirc.grc, scroll to line 5995:
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($1-4 == This nickname is owned)
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(($1-4 == This nickname is owned) || ($1-4 == This nickname is registered.))
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elseif (($nick == Nickserv) && (($1-4 == This nickname is owned) || ($1-4 == This nickname is registered.))) {
Fixed in Gamers.IRC 5.21.