How about a global notice in the header stating: "We managed to fix the issue with creating/editing wiki pages, if you happen to have any issue please report HERE (link to this or another forum thread)"
I've posted a similar message on the devcoin forum - think between the two should be enough. I'm not an admin, just wanted this resolved for everyone's benefit, but prefer not to become point on all things devtome - best they go through signups etc unless specific to this issue.