The Divi 3.0.84 update explicitly set a z-index value for columns of 9. This is causing a number of issues for Divi users.

As Bliss uses overlapping extensively in the design, you may find that some elements are sitting under other elements where previously they were above them. To recitify this issue, add the following to the TOP of the Bliss child theme stylesheet, or your Custom CSS box in Divi > Theme Options > General:

.et_pb_column {
z-index: 1;
}

Applies to Bliss Version 1.0