Updates cause site to crash

Hi,
I recently updated my plug ins and my site seemed fine initially. Then it began freezing. I contacted my hosting folks at WPEngine and they say this is at the head of my site and not resolving:
http://websitewag.com/?dm=1fe8dbc3ed05d08279372fe0259e352b&action=load&blogid=34&siteid=1&t=516684757&back=http%3A%2F%2Ffirst-aid-fred.com%2F

I restored my site to a date before the updates and all seems OK now.

Now, I decided to update again - and try to narrow down the issue. However, now I get this error when trying to update plugins. I'm using almost exclusively WPMUdev.org

Here is the error:

An error occurred while updating Affiliate: Could not copy file. /nas/wp/www/cluster-1186/websitewag/wp-content/ et. etc (different path for each plug in)

Any ideas?

Best,
Aaron