I never thought I'd see the day, but it appears that there are very few errors in patches released by Microsoft in May, June and July 2015 -- so far. My list of problematic patches took a nose dive at the end of April and hasn't bobbed back up.
There's one big problem patch this month. The MS 15-058/KB 3065718 SQL Server patch has a nasty habit of installing on SQL Server 2005, though it's designed for SQL Server 2008, but the problems are well documented in the KB article, and the relatively easy fix -- remove the update -- is detailed in KB 3045303.
In her monthly patch spreadsheet, PatchManagement.org moderator Susan Bradley also notes some reports of problems with print spoolers after installing the MS 15-072/KB 3069392 patch, but the reports are scattered and most (but not all) seem to clear up, particularly when switching to the HP Universal driver 6.0.
There's also this note from Microsoft about the re-issuing of the January patch MS 15-006/KB 3004365:
Bulletin revised to inform customers of the July 14, 2015 reoffering of the 3004365 update for Windows 8.1 and Windows Server 2012 R2 systems. The update provides defense-in-depth measures beyond what was provided in the original update issued on January 13, 2015. Customers running these operating systems who have already successfully applied the update should reinstall the update to be best protected from the vulnerability discussed in this bulletin.
All in all, it's been a remarkably calm three months -- too early to declare that all's quiet on the Windows/Office patching front, but whoever has turned the patching inferno around deserves a lot of thanks.