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Clear the caches. (ACP/Browser)

Certainly “working as intended”. The quote function is linked to the reply form, not any inline editing form one might be able to open as well. If what is described as “expected behaviour”, one could edit earlier posts and quote texts from posts which were made later on the page. Now that would be weird and only cause confusion. 

Wrap the ad code with:
<div data-ipssticky data-ipssticky-relativeto="#ipsLayout_sidebar"> //the ad </div>  

You could add the language string “username_desc”. It will appear automatically below the choice for the username on the registration form. 

For an image, I would probably just check the user group with PHP and then load an image with that user group as file name. 
{{if \IPS\Member::loggedIn()->member_group_id}} {{$group_id = \IPS\Member::loggedIn()->member_group_id}} <img src="https://myserver.com/assets/group_{$group_id}}.jpg"> {{endif}} Then just upload the images: group_5.jpg, group_6.jpg, group_7.jpg. 
Pay attention to caching as well. If the block is cached for all user groups, users would see the wrong images regardless of the PHP check. 
The same method could be used to load different blocks based on user groups. It doesn’t have be separate pages. 

You could always run it from the ACP in the browser. 

I am not really sure what you are asking. There is no dedicated “under construction” function. But by definition, Pages allows you to put arbitrary content on a page, and that would include “under construction messages” you might want to show. You can also use the permission system for this. So, you could work on content you hide from everyone but your admin group, while every group other than “admins” would see your “under construction” message. 

ACP → Community → Forums → Settings → Forum Settings → Topic Summary Settings

That from a Yes/No field which shows for everyone except the premium group. I have a detailed description but that is part of my own premium offers. 😉

Yeah, this can be done. Put the new field to “Member can edit”. Go to your profile and put something in that field. It can be anything. Like the word “Something”. It just needs to register content. 
Then turn off “Member can edit” again, so no one will have access that field. 
Now set the forum output to “custom” and just put your HTML in the box for “Custom topic formatting”. 
You also need to deal with the profile output. Either put your banner in there too or just put in a space or something so it overrides the regular output. Otherwise it will show the “something”. 

The number relates to the current selection, even if it is the default selection. 

It might simply not have content to show. The old method to feed this widget is tags. So when there are no matching tags, nothing shows. 

https://en.wikipedia.org/wiki/Unix_time

It’s a setting in the ACP. Put “newsletter” in the ACP search to get to it. 

There was a patch for that this week. 

Customization → Icons & Logos

You need to force it within the IPS software, not from the hosting setup. 
 

Commerce → Shop → Products → [Category] → Create Product in this Group
Product Type: Normal
Turn on “Renews” 

Thanks. That helped. 
It turned out to be “promote_metadescription_container_nolink”

You choose a default page under ACP → Pages → Pages

Who’s records should they edit? Because for other people’s records, there are just two choices:
you make those members admins you turn on the Wiki functionality Otherwise members will only be able to edit their own records, if the permissions are granted and it is turned on for the database:

 
This might also be of interest:
 

You can’t change the default block position this way. Those are containers with templates executed within them. Moving the containers couldn’t do anything to stuff inside them. 
But if you create what you need in those slots as a Pages block, you can then inject it at any place you want in the theme templates. 
{block="your-block-key"}

I wrote an article about it a while ago. 
https://www.opentype.space/superdocs/ips-community-tips/pages/use-pages-to-verify-apple-pay-through-stripe-r30/

Tip: Create the block in the ACP as Pages block. That way, nothing you do on the front-end can kill it. 

Only by customizing your theme templates. The link for the button is generated in the index -> index template.