All these messages have one thing in common: they were created from email messages. Either they have the form of email messages (with greeting and signoff) or they have quoting and "on [date], [person] wrote...". Not all messages created from emails cause problems, but some do.
Here are some specific messages that have problems from the list of bad bugs Tom posted:
https:/ /bugs.staging. launchpad. net/acpi/ +bug/22336/ comments/ 233 /bugs.edge. launchpad. net/ubuntu/ +source/ glib2.0/ +bug/40246/ comments/ 3 /bugs.staging. launchpad. net/dell/ +bug/59695/ comments/ 168 /bugs.staging. launchpad. net/ubuntu/ +source/ firefox/ +bug/65609/ comments/ 37 /bugs.edge. launchpad. net/ubuntu/ +source/ firefox/ +bug/69931/ comments/ 12 /bugs.edge. launchpad. net/ubuntu/ +source/ mobile- basic-flash/ +bug/129469/ comments/ 1 /bugs.edge. launchpad. net/ubuntu/ +source/ xserver- xorg-video- nv/+bug/ 146706/ comments/ 12 /bugs.staging. launchpad. net/beta/ ubuntu/ +source/ hplip/+ bug/108091/ comments/ 7
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All these messages have one thing in common: they were created from email messages. Either they have the form of email messages (with greeting and signoff) or they have quoting and "on [date], [person] wrote...". Not all messages created from emails cause problems, but some do.