it is a pity that the warning is visible in the red in our log, might scare a user.
About the issues I mentioned above, I did some further investigation/experiment:
I adjusted my check out to revision 11080 ==> build => none of the mentioned problems (only the -ns needed in this case)
Then I started upping to newer revision, a few commits at a time, none of the problems reappeared. Now I am back at the head of trunk, and no problems.
So the spellchecker error and the asserts, all gone.
Weird.
Maybe I should try a clean + build workspace ...
EDIT - UPDATE : I deleted my output30_64 (keeping the devel60_64), ran the update30_64.bat ==> the problems are back : WTF (both the assert and the spellcheck error and the doxyblocks icons problem)