I have very long report (417 pages), and after the upgrade to 5.1.4 I cannot get it to display on a page if there are 2 other macros present. It displayed properly in 5.1.2. I will see the other two macros, but the rest of the page is blank.

If I remove just one of the other macros (doesn't matter which one), the content displays.

I was able to get it to work with the other macros on the page by putting the report in an expansion macro, however doing so caused an issue with some values showing up in the wrong column on a handful of pages.

The report also has 14 columns of information, and some of them have long paragraphs of text; since 5.1.4, Confluence resizes all columns to fit on the page (better than what it used to do), but the resulting problem is the vertical alignment is irregular; not all values display in the upper-left corner of the cell. Status macros in a field in particular seem to be placed randomly.

NOTE: Intentional image blur. I hope you can at least see the part of the display issue, with regard to vertical alignment. As far as making the report disappear, you can try to recreate it thusly:
1) 417 Page Properties Report
2) Change History Macro
3) Child Page Macro