This Barron's article does an unusually good job of describing the two primary (non-forex-related) charges Berkshire took in their insurance business during the quarter. There wasn't a paywall for me. Your mileage may vary.

barrons.com - Berkshire insurance losses buffett

The term "new management" was used several times in the 10Q when discussing GUARD - so that had Ajit cleaning house written all over it.

Barrons accurately describes the Whittaker, Clark & Daniels bankruptcy that produced the charge at NICO as more akin to the Lloyds of London "names" deal from years ago (or the 2014 CNA retroactive deal) - NICO acquired the company (a capital shell of assets to invest and liabilities to manage) in 2007 after it had ceased operations back in 2004. This accounting charge is from a proposed final settlement but we don't really know if the deal from 2007 was good or bad unless someone asks Ajit or Warren at the AGM next year.

The foreign exchange wiggles' effect on NICO's expense line isn't really a cause for concern. Many quarters have been gains - this particular quarter the Yen strengthened quickly and (so far) briefly.