WebIssues is an open source, multi-platform system for issue tracking and team collaboration. It can be used to store, share and track issues with various attributes, comments and file attachments. It is easy to install and use but has many capabilities and is highly customizable.
Version 1.0.5 of WebIssues Server and Client is a bug fix release which fixes the following issues:
By the way, work on version 1.1 has recently started. The first beta version will be released in April or May. One of the main features introduced in this version will be issue descriptions. It will also be possible to use simple text formatting in both comments and description. You can read more about it in this blog post.