Why do the columns in my bar graphs keep disappearing?

Hi,
I've been trying to use graph tool in Illustrator CS6 (I have Creative Cloud..) but having some issues when changing the design of columns. I'll create a design for a certain set of columns, but when I try to use the design in the graph itself they disappear completely. The data still shows in the data menu, but no bars! And its not on all the bars, usually just one set.  I've tried reentering the data and also recreating the column design and nothing seems to be working.. Does anyone have a fix for this? I keep having to restart graphs and having the same issue. Any help would be appreciated!
Thanks!!

Hello, I am seeking the answer for the similar question.
As you can see, the data window has two columns, and the legend has two colors. But only one set is drawn.

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      Type: GPU
      Bus: PCIe
      PCIe Lane Width: x16
      VRAM (Total): 1024 MB
      Vendor: ATI (0x1002)
      Device ID: 0x68a1
      Revision ID: 0x0000
      ROM Revision: 113-B9710C-238
      EFI Driver Version: 01.00.417
      Displays:
    iMac:
      Display Type: LCD
      Resolution: 2560 x 1440
      Pixel Depth: 32-Bit Color (ARGB8888)
      Main Display: Yes
      Mirror: Off
      Online: Yes
      Built-In: Yes

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