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Subscriber update preferences screen is blank

I have a fresh install of phplist and it all is working fine except when a subscriber clicks on the email link to Update Preferences it goes to a blank white screen.

Here is the page source code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" dir="ltr">
<head>
<meta http-equiv="pragma" content="no-cache" />
<meta http-equiv="Cache-Control" content="no-cache, must-revalidate" />
<meta name="License" content="GNU Affero General Public License, http://www.gnu.org/licenses/agpl.html" />
<meta name="Author" content="Michiel Dethmers - http://www.phplist.com" />
<meta name="Copyright" content="Michiel Dethmers, phpList Ltd - http://phplist.com" />
<meta name="Powered-By" content="phpList version 3.4.4" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link rel="SHORTCUT ICON" href="./images/phplist.ico" />

Update: If there is no UID then the screen comes up asking for an email address.
www.mydomain.com/lists/?p=preferences

as opposed to www.mydomaian.com/lists/?p=preferences&uid=50bab840a8072b4bcbbacd499a44673c

Hello @rgjerde and welcome to the forum!

Have you edited the public page templates at all to change them from default? Are you running the latest version of phpList from the Automatic Updater / Sourceforge?

There were some jQuery related issues some months ago which caused public pages to be blank but they were resolved a few releases back. If you inspect the page source code and find that the HTML body tag has a CSS class which makes it invisible, then it’s jQuery related.