Well... it's now been a year and still not fixed. Really, really sad. I am lucky that I have few employees so I can use the "Reports" instead of the Summary form the Employee Center, which still gives the Pivot Table Error. A few of the tabs in the resulting export are correct, but some important ones contain "sample data".

I think that support is not being truthful when they say it's being worked on as it can't possibly take a full year to fix.