cannot print graphs from Activity Summary | Disk (4339800)

When trying to print the graphs from the second tab of Activity Summary (Disk) only header and footer are printed without any graphs in the middle.
Same is observed in the Print Preview of this tab. All other five tabs show and print just fine.

Attached is a patched version of the Spotlight on Unix plug-in.

To apply the patch:
 

1. locate and rename the current Spotlight on Unix plug-in file (SoU.spx) Usually in the folder c:\program files\Quest Software\Spotlight\Plugins\SoU)

2. copy the attached SoU.spx into the folder.
 

3. Run Spotlight.

Spotlight on Unix 8.0.0.1630