Preface
On both my experimental XOOPS-sites
http://xoops-themes.jungles.net.ru (aka themes.xoops2.ru)
http://xoops-modules.jungles.net.ru (aka modules.xoops2.ru)
I have identical pair RSSFit+XHLD for exchanging feeds

Problem
XHLD on Themes can read and show feeds from Modules
XHLD on Modules can't read and show feeds from Themes - it shows nothing, no channel's data, no item's data.
Well, anybody can say - "it's not XHLD problem, you have broken feed!"
It can be true, but (as usual, "but" happens)
Even if I try aggregate from Theme's backend.php - I got filled channel info and empty body,only link "read more" (with correct URL to my first news)
If I try see feed in browser - I get it!

It drive me nuts, I'm totally lost

GIJOE, if you want - I'll give you admin's rights for your module on both my sites easy

Oh, I see new version of XHLD ready. I'll try it and will write results

Must said some time ago, but go here only today - with 2.82 (and changing nothing more) problem was solved "automagically". Don't ask "why?"