My problem is that newly registered members can't log in. Here's the error they get:
Microsoft VBScript runtime error '800a005e'
Invalid use of Null: 'cLng'
/forum/inc_func_common.asp, line 881
When logged in as Admin, I see the newly registered members' usernames under "Members" section. However, under the column "Title" it says "Error". After I change a member's title from "Error" to "Member", that member is able to log in properly.