An error pops up in Excel 2010 "Cannot use other fonts, close several others" where to dig?

Question

excel

There is a PC in a domain environment: i7, 8GB OP, Win 7 Pro
While working with a large number of Excel 2010 workbooks, the error periodically pops up "it is impossible to use other fonts, close several other documents and try again"
All open Excel workbooks freeze, and you have to close all the workbooks through the task manager.
These errors also hang in the event log.

The PC is not heavily loaded when working with Excel workbooks. The load on the OP and CPU at the peak of 50%

Answer 1

You have encountered a limitation of chart fonts (512 pcs.) which occurs when autoscaling charts.
Try to disable this option in the settings or save the document in Excel 2007 compatibility mode (there was no such feature then)