Thank you, Bachhar for the thorough and full answer!

Alexander!

For Categories  Overview it tells me I have 2 selected items but under Categories tab I have 0 Tags and The groups section tells me it is restricted and  I do not see any tick boxes on the page.

2 for categories it is a bug we are fixing now. Every member has it if there is no any subscription.

Just before your update I received and email entitled "[ISC-DC] Encoding issues ..." which is an issue I am not explicitly trying to watch. When I click on the Purple Unsubscribe at the very bottom of the email. 

It seems it's a bug. We'll try to fix it. 

Hi, Mark!

That's a bug, which shows +2 categories for every member now.

You can turn off any email notifications from developer community on the Subscription/Overview page:

Point "No" for "Receive notifications" setting.

Hope that helps!

Hi, Alexander!

1. How can I figure out which restricted group categories I am in?

About subscription types on DC: 

1. General subscription to all posts, answers, and its comments.

You can setup this on Subscription/Content types page:

2. Subscription to Groups and Tags.

You can subscribe to the Groups and Tags as you mentioned in your question.

All your subscriptions to this stuff can be managed on Subscription/Categories page:

3. Subscription to particular topics. 

If you favorited (star) the page, or answered/commented it, you are automatically subscribed to the page. 

To alter the list of this subscriptions open Subscription/Page/Threads page:

2. How do you actually unsubscribe from those categories.

You can do that in the settings, as listed above.

Also with the latest DC release, we improved the notifications, so once you get the notification now, there is the related unsubscribe button which leads to a right place to unsubscribe from these type of notifications.

There is no option at the moment but we'll introduce it soon.

Hi, John!

Thanks for the feedback.

Re #4, I just went through the 46 pages that the "unanswered" filter returned, looking for questions I asked in order to pick an accepted answer. Could I have done that more easily than scanning each of the 46 pages one at a time?

Very good question.

There are two ways at the moment:

1. Walk through your posts (Member's posts can bu found on member's page).

But there are questions and articles together.

2. Filter your questions on the analytics page.

Hi, Alessandro! Thanks! 

Yes, I was asking about how to show the number of rows.

I managed one approach with Expression on the Column and introducing Total like this:

With the MDX Expression:

SELECT NON EMPTY {[Measures].[Amount Sold],%LABEL(1,"To calculate the rows","")} ON 0,NON EMPTY [Outlet].[H1].[Region].Members ON 1 FROM [HOLEFOODS]

Along with the setting for the Pivot in Analyser to show the Grand Total.

So, do you have the way to make it via MDX only?

You can switch off (and switch on) all the notifications with this control in Subscriptions->Overview tab:

Hi, Skip!

Thank you for the feedback, we will investigate that. 

There are cases when the filter should be chosen by the user. 

Suppose you are creating the Dashboard which shows the stats of contribution for the particular member in Developer Community.

The dashboard makes sense only with a member as a filter. What member to choose by default?