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Pligg Support

when the search system wants to search tag with space it will search tag/tag+tag/ but it's not working.
Any idea why? It also doesn't seem to be working on the pligg site..
Try to search any tag with space like this:
http://pligg.com/support/tag/blank+page/
i install pligg with it's default theme,
0- user01 creat group G01
1-G01 have 100 user
2-user01 select user02 as admin
3-user01 select user03 as moderator
4-user02 can not edit other users?! why?
5-user03 can not edit other users Too !!!
6-only user01 can see edit or deactivate BTN
7-plz Help me