Okay, I see the problem; you're making use of ":" to indent each line of text. Here's a copy/paste of a section:
: John and Melissa are 1st cousins; both born with surname LEWIS
: Shared grandparents are: Joseph Lewis and Nancy Faulkner
: 2nd MARRIAGE:
: 1896: marriage of John G Lewis to Sarah R ___ (per 1900 census - married 4 years)
: 3rd MARRIAGE:
: 1904: marriage to John G Lewis to Susan ___ (per 1910 census - married 6 years)
I bet you're expecting a blank line before "2nd MARRIAGE:" and before "3rd MARRIAGE:"
To achieve that you need to do this:
: John and Melissa are 1st cousins; both born with surname LEWIS
: Shared grandparents are: Joseph Lewis and Nancy Faulkner
::
: 2nd MARRIAGE:
: 1896: marriage of John G Lewis to Sarah R ___ (per 1900 census - married 4 years)
::
: 3rd MARRIAGE:
: 1904: marriage to John G Lewis to Susan ___ (per 1910 census - married 6 years)
This was true before the redesign of the interface. At least, in my experience, that the use of a "::" between indented lines that start with ":" has always been required to insert a blank line.
When NOT using ":" you simply add a blank line with your RETURN or ENTER key.