Admin unable to use some File Gallery functions, such as "Create File Gallery" due to conflict with (tiki_p_admin) permission.

I am a new user to tikiwiki and have had a problem using File Gallery on two fresh separate installations of tikiwiki 8.4, and 9.0.

I only had one user set up which was the default admin user, and found that I was unable to use the "Create a File Gallery" function was also unable to "Edit" any file galleries that existed. When I tried either of these functions it would take me to a page that said

Error
You are not logged in. Go to Log in Page

even though I was logged in, if I clicked on "Go to Log in Page" it would take me there and show

Log in
Logged in as: admin

I turned on php error reporting and these are the errors I receive after clicking on save in create a file gallery function.

PHP (5.2.17) NOTICE (E_NOTICE):
File: lib/setup/user_prefs.php
Line: 12
Type: Undefined variable: user

PHP (5.2.17) NOTICE (E_NOTICE):
File: lib/setup/user_prefs.php
Line: 14
Type: Undefined variable: user

PHP (5.2.17) NOTICE (E_NOTICE):
File: lib/setup/user_prefs.php
Line: 15
Type: Undefined variable: user

PHP (5.2.17) NOTICE (E_NOTICE):
File: lib/init/smarty.php
Line: 176
Type: ob_end_clean() ref.outcontrol: failed to delete buffer. No buffer to delete.

I do know small amounts of PHP scripting, html coding, and the like, and dove into some of the script, but I do not know where the user variable is supposed to be created to be passed from page to page, or if the cookie is somehow not being verified when trying to pass information from one page to the next.

I also went on tiki's forums and saw that a few others have posted similar experiences, but no working answers were supplied for me.

What I found is not necessarily a solution, but a quick work a round that does allow access to those functions, but I reported this as an error because I do not believe this is an intended problem within tikiwiki.

A person who is experiencing this problem needs to create a new user for themself in a new group that can have almost all admin permissions.

Through elemination I found that the tiki permission

Administrator can manage users, groups and permissions and all features (tiki_p_admin)

is what is causing a conflict with the file gallery functions. All other permissions can be enabled and file galleries works fine.

The necessity for creating a second user is due to the fact that the admin or at least one user must have the permission that is causing the problem, or you lose the ability to assign permissions.

Thanks for reading and I hope I have supplied enough information to recreate the problem and also find a solution in the future.

This bug has been demonstrated on show2.tiki.org

Please demonstrate your bug on show2.tiki.org