Since 6.2 (and XE-1419) there is no base skin by default which mean
that if you forget to set a base skin in your wiki skin it inherit
directly from /templates and /resources. XE-1419 was done mostly to
make sure colibri and flamingo were not going to inherit from each
other.
This leaded to
http://jira.xwiki.org/browse/XWIKI-11443, I see several
possibility to close this issue:
1) won't fix, if you want a default base skin then just set it in xwiki.cfg
2) put back the default skin in xwiki.defaultbaseskin (so flamingo) in xwiki.cfg
3) force wiki skin to fallback in default skin
The issue with 3) is that it makes impossible to do a wiki skin from
scratch (why not ?).
Now that filesystem skin explicitly indicate there parent skin 2) is
not a problem anymore for them so we could put it back, I guess my +1
goes to than and that's what I will do to unlock 6.4 if there is no
answer.
I don't have a strong opinion on it since I pretty much never ever do
any wiki skin, just want to close this issue...
--
Thomas Mortagne