Error: string ("0") as a HASH ref while "strict refs" in use

There should be a little more information in the error.  Does it reference specific modules?  Is this a standalone or HA UTM?  This error is generally shown when data is missing or corrupted.  If HA, you may just need to shutdown the slave nodes, then turn them back on to force a re-sync.  If standalone, you could try rebuilding the database.  Be aware that by doing the rebuild, you will lose any existing reporting information, starting fresh.  Raw log data will be untouched.

/etc/init.d/postgresql92 rebuild

Thanks Scott, I think that worked. This is a stand alone UTM and I didn't mind losing the data as it had been broken for a long time. I don't have the error anymore, but it was on most reporting pages and specifically the bandwidth usage report.

Glad to hear that your up and running again.