Upon using the 'Activate Chapter Grouping' function of the 1.9 version of Course Menu block, all the chapter titles change from the default 'Chapter 1', 'Chapter 2' text (or whatever text I have added in their place) to just three dots '...'. It does this for each chapter added.

I have extracted the truncating function from the code and run it in isolation and it appears to work fine, so I think the data supplied to it may be in error, yet when base64-decoding and unserealizing the config data from the block instance table, everything appears exactly as I have set it up.

This issue originally posed in Modules and Plugins: http://moodle.org/mod/data/view.php?rid=926&page=90