When browsing the repository, the "Browse Repository" drop down used to show "All" by default, but in 1.4-M4 it is initially blank (see ArchivaBrowse1.PNG)
When I click the drop down and select a repository, at first I see an error that I must be logged in or have sufficient privileges. If I am not logged in, I get a login prompt (see ArchivaBrowser2.PNG).
If I am logged in as the Admin user, I just see the error "You need to be authenticated for this action or have more privileges" (see ArchivaBrowser3.PNG)
If I simply reselect the repository from the drop-down box, it works most of the time (authenticated or not).
After clearing my browser cache, it happens less often, but still does it.