The next and previous buttons on the project browser don't remember the current sort setting. Pressing next or previous will always reset back to "recently updated" even if another option is applied.
Added in 97e78dec
Added in e2c77553
Fixed in 7fabf0a7
mfn should check whether a new entry is still unread, so it doesn't send already-viewed entries. For example, when adding a new RSS feed and selecting "mark all as read", mfn currently still sends emails for all new entries.