Here's what I heard from NetApp:
There is a known issue with the changes in how ONTAP 8.1.3x handles performance queries. The relevant BURT is #738776 and the remedy is to upgrade OCB to the current release 4.1.1.1. Unfortunately, I do not have enough familiarity with OCB to quantify why the one partner is still reporting performance data. I do know that the change to ONTAP made it load sensitive- if the response to OCB requires too much resources (memory) ONTAP will send a different response. OCB 4.1.0.2 is not prepared for this behavior whereas the code in 4.1.1.1 is modified to accommodate.
To obtain the latest Balance version, 4.1.1.1, please log into the Support website and navigate to the software downloads
https://support.netapp.com/NOW/download/software/oncommand_ib/4.1.1.1/download.shtml
Please review the notes on this page prior to downloading and installing OCB.
The OnCommand Balance Installation and Configuration Guide and the Release Notes are also accessible via this page.
I'm going to upgrade Balance this morning and see what happens; I'll post back my results.