The "issueNNN" link detection/formatting code in 
0.5.4 gets confused by links which happen to 
contain "issueNNN".

For example, message text containing:

http://badger/Test/issue1

gets mis-formatted when displayed in a message 
field as:

issue 1">http://badger/Test/issue 1

the raw source of this field:

     <pre><a href="http://badger/Test/<a 
href="issue1">issue 
1</a>">http://badger/Test/<a 
href="issue1">issue 1</a></a>
</pre>

This means I can't link to issues on other trackers 
either on the same Roundup server or on different 
ones.

Looks like the issueNNN formatting is running in 
addition to, and after, the http:// formatting.