Empty space on Notifications at the frontend menu

Add this to your style.css: body ul ul#ap-notification-dropdown li { width: auto; }

allow all users upload pictures

You can simply allow user to upload in AnsPress options -> permission

Child Theme Content Disappears

As you are using AnsPress RC version, hence copy anspress folder from askbug to askbug-child

submit time

You can try to changing this: https://github.com/anspress/anspress/blob/master/includes/functions.php#L215

NO LIGHTBOXES ?

May be its because question, answer and comment form are loaded using ajax and you need to rebind them or just use jQuery delegate.

user page cannot split to be multipage

Set page template as “Login Page”

Upload file Limitation

Check AnsPress Options -> Permissions