I updated to the newest version of word press and it changed my home screen. Essentially it shifted my text to the right and as a result shifted my "main sidebar" widget downward to now begin below the body of text. The main text body also overlaps the widget cutting off the top left corner. I'll note that we are using a custom theme generated by someone in the organization other than myself.
Here is a before and after:
What's happened and how do I fix it?
UPDATE: I visually noticed that the width of the white space margin around my text has grown larger (essentially shrinking my usable space). Perhaps this is the underlying problem? Was that just a part of upgrading to 4.5? I should probably start there -- Where/how do I change the width of the white space on the page?
UPDATE2: I actually also noticed 2 other changes to my page: 1. The font size of the heading got much larger. 2. If I change the layout to right-column oriented, the widget still floats down below -- this owuld suggest to me that the widget code itself also changed...
How do I revert the listed issues to previous formatting so that the website works as it should?