Save Message History is producing a file that does not contain any actual message history. Instead, it contains strings of the form "<div>net.rptools.maptool.model.TextMessage@<hex number>"
Steps to reproduce:
0. Running MapTool 1.2b17 on Ubuntu Linux, Sun Java 1.5.0_08.
1. Create a server and type some messages into the chat window.
2. Select File > Save Message History, and choose a filename to save as.
3. Open the file in a web browser, text editor, etc. to examine it.
Should see the messages I typed in some form.
For each message, there is one line similar to this one: <div>
Attached a log showing the same thing.