Original Submission Current state:
"Mediawiki for project NEW_PROJECT : /var/lib/codendi/mediawiki/projects/NEW_PROJECT not created yet, please wait for a few minutes."
lasts for days.
However, existing Mediawiki on older projects still work.
UPDATE:
I managed to find a workaround for this Bug:
it appears to be related to the overall problem with Browser Cache in recent Tuleap updates. See bug report #11453.
the solution to load Mediawiki is to:
1) switch to DevTools browser mode;
2) check TevTools > Network > Disable cache
3) navigate to project admin settings > mediawiki
4) open mediawiki service edit modal (play with enable/disable checkbox for example)
5) navigate to mediawiki service page on Tuleap left service menu > Language (select) + save changes
6) enjoy mediawiki project instance.
Conclusion: the browser cache bug reported in #11453 is still making life unpleasant.
For instance, new artifacts - from modified tracker templates - refuse to open in modals when created from backlog. I;m still playing around to find the workaround for those cache problems.