Did you verify that a -filter-mobiledev dowgrade fixes your problem?
(starting from bpo install with -filter-mobiledev, -emailmerge and -java-common from testing)
downgrading -emailmerge and -java-common fixed nothing; downgrading -filter-mobiledev fixed my problem. Upgrading the packages again caused the same problem to occur, downgrading -filter-mobiledev again fixed it, this time retaining the other two from testing.
HTH, Henk