User-Agent: / (Windows; U; Windows NT 5.1; en-US; rv:1.6a) Gecko/20031010 Build Identifier: / (Windows; U; Windows NT 5.1; en-US; rv:1.6a) Gecko/20031010 Entering a subject line then performing undo (either through CTRL-Z or Edit->Undo) results in a block character appearing in the title bar "Compose: [BLOCKCHAR]" It's those block chars that appear for weird ascii values. Probably "Compose: (no subject)" or "Compose" should appear instead. Reproducible: Always Steps to Reproduce: 1. Go to Compose message 2. Enter some text in the subject line (notice the title bar) 3. Hit Control+Z or Edit->Undo and notice the block in the title bar Actual Results: Block in title bar Expected Results: "Compose: (no subject)" or "Compose"

*** This bug has been marked as a duplicate of 147625 ***