Flag did not appear in Task Bord for List view in FireFox 3.6.6, IE7/8

The Flag does not appear in Task Board for List view only if Greenhopper 5.0.1 is installed. Using Greenhopper 4.4.1 does not caused this problem.

Here are the step to replicate this problem:

1. flag an issue
2. view issue in Planning Board in Summaries and List (the flag appear for the issue)
3. view issue in Task Board in Summaries view > the flag will appear
4. view issue in Task Board but in List view > the flag is not there

This does not happen if using Greenhopper 4.4.1 and JIRA 4.1.1.