When a group is titled with a # sign in the beginning of the name, the # sign is not correctly converted to %23 when passed as a parameter.

To replicate:
1) Create a group with the name #xxx
2) Add 11 users to the group (more than 10)
3) Go to Administration -> Manage Groups
4) Click on the second page of the group. The URL will have a # instead of %23. For example:
http://localhost:8081/admin/users/domembersofgroupsearch.action?membersOfGroupTerm=#HX%20Exampt&startIndex=10

Which should be:
http://localhost:8081/admin/users/domembersofgroupsearch.action?membersOfGroupTerm=%23HX%20Exampt&startIndex=10