Having ~300 unread feeds from over 20 sources (including twitter)
"All Tags" (Alle Tags) is marked.
I click on "Unread" (Ungelesen) -> jumps back to "Newest" (Neueste)

"Twitter" source is selected/marked:
I click on "Unread" -> jumps back to "Newest"

Another source/tag is selected (e.g.: a facebook feed):
I click on "Unread" -> all unread feeds are shown as inteded.

Having >1000 unread feeds.
"All Tags" is marked.
I click on "Unread" -> all unread feeds are shown as inteded.

(Maybe caused by the twitter integration?)

Expected behavior:

Having a varying number of unread feeds including a twitter source.
Any desired tag is selected.
I click on "Unread" -> all unread feeds are shown.

Workaround (just found out):
setting the parameter in the config.ini:

• homepage=unread