CRM 2013 new form layouts prefers 3 column tabs with 1 column sections over the CRM 2011 1 column tab with 2 column sections. The nice thing about this new layout is that as you resize the browsers window the containing sections will arrange themselves to fit cleanly within the window. This is typical behaviour of floating elements. So for example as you shrink the size of a window a tab with 3 horizontal sections will start to stack on each other vertically. While creating a few custom entities I noticed a slight rendering problem when resizing the CRM’s window. The gap between the final field is a section and the next tab would increase. Take a look at the screen shots below.
Recently I encountered a problem where by I could not see the ‘Posts’ tab on the new activity feeds for out the box entities like Account and Contact. The issue only seemed to occur for my organisations that had been converted from MSCRM 2011 to MSCRM 2013. For any new organisations that I created on 2013 the ‘Posts’ tab was visible. What appears to have occurred during the upgrade process is that I didn’t receive any changes to the sitemap. This meant that I could not see the new CRM 2013 sitemap items like the ‘Whats New’ Activity dashboard, but more importantly I could not see Post Configuration which should be accessible from the Settings. It is within Post Configurations that you can activate posts for given entities. In my case all entities had posts deactivated apart from user. To activate posts and therefor make CRM render the posts tab follow the instructions below.