I recently upgraded from 4.3.4-8 to 4.3.4-14 and encountered a similar problem to the (now-archived) #396659 wrt Vim tab-completion not working.
(Restarting zsh or `exec zsh` did not fix the problem, nor did purging the package and re-installing.) However, removing ~/.zcompdump and then restarting zsh fixed it for me. /Lamby -- Chris Lamb, Cambridgeshire, UK GPG: 0x634F9A20
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