RRD zoom issues

Hi,

Since the upgrade to 4.3, we have issues when zooming in on the graphs.
See the attached screen shots.

It looks like the max and min values are calculated wrong when zooming in.  
This messes up the scaling of the graph.
Does anyone sees the same behavior?

Rrdtool version: 1.4.7-2ubuntu5
Xymon version: 4.3.17


Stef