Created attachment 213956 [details]
Debug file with perhaps show why happening this interesting issues

Dear Developers,

I experienced some interesting similar issues with Thunderbird 12.0 and all Orca versions:
1. If a letter containing a link, caret navigation works right until the caret not land the link. After this when I press a Down arrow key, the caret moving the first line the message. When I try moving again after the link with arrow keys, the problem beginning again. This problem happening usual with unread messages.

Not always happening this situation, and after I doed an orca --replace command, I possible reading entire letter.
Unfortunately I unable to make a debug.out yet when I experiencing this issue, because when run orca --replace --debug-file=debug.out command and opening again the letter, the issue is not happened me. :-(:-(

I use following possible this problem related app settings in Orca with Thunderbird related:
Grab focus on objects when navigating check box: checked,
Sayall webpage when first load check box: checked.

2. I get now a message with I experiencing following similar issue:
If I navigate the last line the message and press DOWN arrow key, Orca jumps the first line of the message. Fortunately this problem I possible creating a debug.out file. Hopefuly if possible fixing this type problem in Orca, the first described links related issue are resolved too.
You found importanter informations the debug.out file after following Speech output related line:
SPEECH OUTPUT: 'Üdv: Lajos'

Possible need fixing this type problems in both Orca master branch version and gnome-3-4 branch.

Attila