I have the same problem, I can't install Nant's Gallery 1.0RC2SR1 and I ran the debugging.

The Screen Read:

Upload showPlugins - Failed
Another plugin is already using directory: "/home/bjadmin/public_html/main/components/com_comprofiler/plugin/user/plug_cbprofilegallery/"
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Joomla! 1.0.11 Stable [ Sunbow ] 28 August 2006 20:00 UTC
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SET sql_mode = 'MYSQL40'2
SELECT template
FROM jos_templates_menu
WHERE client_id = 1
AND menuid = 03
DELETE FROM jos_session
WHERE time < '1186110669'
AND guest = 1
AND gid = 0
AND userid <> 04
UPDATE jos_session
SET time = '1186112469'
WHERE session_id = '48c547ed566396fef293df2c51ccdd0d'5
SELECT COUNT( session_id )
FROM jos_session
WHERE session_id = '48c547ed566396fef293df2c51ccdd0d'
AND username = 'Brandon'
AND userid = 636
SELECT a.id, a.title, a.name
FROM jos_sections AS a
WHERE a.scope = 'content'
GROUP BY a.id
ORDER BY a.ordering7
SELECT params
FROM jos_modules
WHERE module = 'mod_mainmenu'
ORDER BY title8
SELECT menutype
FROM jos_menu
GROUP BY menutype
ORDER BY menutype9
SELECT *
FROM jos_components
WHERE name != 'frontpage'
AND name != 'media manager'
ORDER BY ordering, name10
SELECT id, title, module, position, content, showtitle, params
FROM jos_modules AS m
WHERE m.published = 1
AND m.position = 'header'
AND m.client_id = 1
ORDER BY m.ordering11
SELECT COUNT(*)
FROM jos_messages
WHERE state = 0
AND user_id_to = 6312
SELECT COUNT( session_id )
FROM jos_session
WHERE session_id != '48c547ed566396fef293df2c51ccdd0d'13
SELECT id, title, module, position, content, showtitle, params
FROM jos_modules AS m
WHERE m.published = 1
AND m.position = 'debug'
AND m.client_id = 1
ORDER BY m.ordering