True, I find that the Like button for Facebook ends up wayyyy to the left (IF the browser is stretched too wide), but the others Twitter, Google, and the pull down for the rest, align okay.

Correct. I see the same just to the right.

I am suddenly getting a 403 FORBIDDEN error on Facebook-share all other works superbly well.

Well, at my 5.2.4 forum the Facebook integration works correctly. But the only thing we use this mod for is the Facebook Like button. This works via this mod.

To publish something to Facebook at the same time as at the forum is a vbulletin function not part of this Mod anyway. Is that what you mean by the Facebook-share?

I know this mod is due for an update, sorry, it will be the first big mod I overhaul when I get some time.

The only thing this mod does is put various Like/Share buttons on the page, it isn't designed to automatically share any content upon posting.

It seems that with vb 5.3.4 the AddThis button is no longer there...the Facebook, Twitter and Google buttons remain.

Only the Facebook and Twitter buttons remain.

1)
And also there is an issue that the http needs to be changed to https for at least twitter:

<script id="bop5twt" type="text/javascript">
(function() {
var twitterScriptTag = document.createElement('script');
twitterScriptTag.type = 'text/javascript';
twitterScriptTag.async = true;
twitterScriptTag.src = 'http://platform.twitter.com/widgets.js';
var s = document.getElementsByTagName('script')[0];
s.parentNode.insertBefore(twitterScriptTag, s);

http://platform.twitter.com/widgets.js
needs to be
https://platform.twitter.com/widgets.js

2) Within the AddThis_toolbox you appear to be using, also there is an https problem:

addth.src = 'http://s7.addthis.com/js/250/addthis_widget.js#pubid=';

should be
addth.src = 'https://s7.addthis.com/js/250/addthis_widget.js#pubid=';

Both of these appear to be inside the
product_bop5moresharevb5.xml

All right I went into your product_bop5moresharevb5.xml and using Xcode converted all of your http to https. The mod runs better now. More of your buttons load.

However, the following URLs used within your XML are dead links:

https://www.google.com/webmasters/+1/button/

https://twitter.com/about/resources/buttons#tweet

https://static.ak.fbcdn.net/connect.php/js/FB.Share

so you need to update your app to use new resources, or remove whatever functionality these URLs need to pull, because it leads to page load errors otherwise.

I believe these are the errors that still now load related to your app, AFTER changing all of the http to https within your XML:
https://imgur.com/DpNvHk1
there were more errors previously, but these remain.

I disabled this mod because it doesn't seem to work any longer on vb 5.7.5, at least not the Facebook "Like" button.