Limit on max # of LiveOffice objects in one file?

I'm working with an excel file that is using many LiveOffice objects, and until Friday, it worked like a charm. However, on Friday, I realized that I needed one more LO object - a single cell to tell me the last date refreshed on a saved query, and this pushed the total number of objects to 13. As soon as I added that object, I've been unable to do a "Refresh All Objects" in the file without receiving the following error:
"An error occurred when rendering the view"
I don't know if this error means the data being returned is wrong or incomplete. It wasn't in the one instance I tested, but I can't test all the infinite possibilities of combinations.
If I refresh each object individually, I get no errors. But who wants to ask users to individually refresh thirteen objects (all but two of which have synchronized prompts - that are not synchronized when run individually - making them have to enter prompt data 11 times!)
Is there a limit in LO for how many objects you can have? Is 12 the max? Or is somethign else going on? Any ideas?
Thanks!

The cost of adding a VO in an AM is that BC4J would have to load the view def (from XML) and instantiate the VO when the AM is instantiated.
Hence, you may notice performance impact if you have too many VOs in an AM. 75 does sound a bit high. If things can be partitioned into multiple AMs and define a parent AM that contains these smaller AMs, that would be better.
Thanks.
Sung

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