Switching from tag to trunk results in a 500 Server Error

Customer reported:

Under some circumstances (haven't been able to pinpoint exactly, but it always occurs with a folder on one repository)

(You can access this folder using: http://www.bubblestuff.com:8060/jira/source/browse/HP/Emulators/emu48/trunk/EMU48.C)

Enter the HP repository and have selected a file. You are looking at the revisions screen.
In the tag selector select: emu48-1.44 tag (or any tag for the emu48 project)

You now see the revisions of the file for that particular tag.
Now click on "trunk" on the left of the tag name.

You then get a red screen with:

Your request was unable to be processed
javax.servlet.jsp.JspException - javax.el.PropertyNotFoundException: The class 'com.cenqua.fisheye.Path' does not have the property 'encodedUrl'.

javax.el.PropertyNotFoundException: The class 'com.cenqua.fisheye.Path' does not have the property 'encodedUrl'.
The class 'com.cenqua.fisheye.Path' does not have the property 'encodedUrl'.

You are running release CR2.7.2 FE2.7.2 (20110919054222 2011-09-19), please report your release number when reporting bugs.

You can select any tags, just not trunk

Please note that the mentioned URL is normally not publicly accessible.
Customer kindly opened it up to assist in solving this issue, but it will be closed up again in the future.

I reproduced this on OSX 10.7.1 with

• Chrome 14.0.835.186
• Opera 11.51
• Firefox 6.02
• Safari 5.1 (7534.48.3)