I noticed an issue with module extensions that allow for custom php/javascript to be used. Although the modules get translated, joomfish inserts backwards slashes into the code, breaking it in the process.
The old version on joomla 1.5 didn't do this.
I tried and encountered the same problem with the following module extensions
(probably does the same with others too):
Flexi Custom Code
Easy Script
Blank Module
For example the code I enter is:
`
`
But on save, Joomfish turns it into:
`<div class="classname">
`
Here's a screenshot:
http://img94.imageshack.us/img94/1564/joomfishflexi.jpg