Indeed, such blurring happens. The reason for this is actually a bug in the WPF framework, when the chart is nested in a more complex layout and the width of the grid lines is 1px. Presently, the framework does not allow a stable fix. If a snapping or clipping is used, there are some specific cases when the lines disappears. That is why we made some additional modifications to the control - they ensure that all elements are always visible - in some cases they may be slightly blurred, but they will be always visible. At present, there is no other option to handle this or work around this bug in the framework.
the Telerik team
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