Hi Bernard,

thanks for your help and commitment, I found the issue: it's very strange, but it was due to the IE add-on "Shockwave Flash Object" version 11.2.202.233, that it seems was blocking some files. I disabled it, did not see the issue, then upgraded it to the last version, and now my user has not the issue anymore.

I googled a little bit for this issue but actually I found nothing, maybe I will indicate it to Adobe's support or search in Adobe's community to see if someone else had 401 problems.

Thanks again !! :) :) I will update the discussion if something else come up.

This is the problem .. :) I cannot reproduce the issue locally ...

The grid loads about 60 rows, so a scrollbar is supposed to appear on the left side on the page, but it does not appear, so even if the data are loaded the user cannot utilize them...