Help! Lines missing from series???

[User (Legacy)]

Gallery is set to step (behavior is same if gallery is set to lines)

Notice the top series.  The YAxis scale is -10 to 10.  The first YValue is 8.  After some time, I change it to 11.  Then, after some time I change it back to 8.

Then, after time, I change it to 10.  Then, after time I change it to 8.  Then after time I change it to 11 again.  Then after a long period of time, back to 8.

Sometimes the line appears and sometimes it doesn't.  I can repeat this test exactly and get different portions of the lines to appear/disappear.

Even if the Yvalue being plotted is outside of the YAxis Max I would expect the series line to appear going off the top of the scale as it does in the first

segment of the series.  If I resize the chart, portions of the series will appear and disappear.  What am I doing wrong?

Please reply in the newsgroup or to dan.folz@iac.honeywell.com.  We are almost ready to release our product and I must make the lines stay visible.

I've tried everything I can think of....  Please help.

Dan Folz