>Technical Support>Odd graph background and axis
No big deal to me, just thought you may want to know. Hope the parameters on the link address captured all the info you need.
This is a known problem with the graphing software. I'm not sure if they fixed the problem in the latest release. I don't know if they're still working on the software, to tell you the truth. They haven't come out with an update since 2011.
The problem is caused by a large x range. Your examples graphed some 2.5 years worth of data, and I think the gray area is actually the minor x-axis interval lines.