Some text edits don't appear after emailing PDF

i'm using acrobat pro edit pdf files sent coauthors. not using "managed reviews", sending pdf files , forth comments , edits, 1 file each author. (yeah, email review features make easier coordinating author, don't think push unless can fix problem simple method authors can understand.) setup: os 10.6.4, acrobat pro 9.3.3.

 

here's what's happening:

coordinating author sends me draft. open acrobat , add comments using sticky notes , make various edits using text edit tool. when roll on or double click comments , edits, show normal. save file, attach email (using apple mail), , send coordinating author. receives thunderbird , opens acrobat reader 9. can see sticky notes , deletions strikethrough text, edits replaced or added text don't appear @ all. he's running os 10.6. i've tried enabling comments acrobat reader, didn't change anything. i've sent file myself via email , works fine, don't think email system screwing up.

 

any idea might going on?

are of fonts embedded?

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