freaked-out electron-flow arrows

Paste this structure into MarvinSketch:

<?xml version="1.0" ?>

<cml>

<MDocument>

  <MChemicalStruct>

    <molecule molID="m1">

      <atomArray

          atomID="a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 a12"

          elementType="C C C N C C Br C C N C H"

          formalCharge="0 0 0 -1 0 0 0 0 0 1 0 0"

          x2="18.81355003448904 17.479880693440784 17.479880693440784 18.81355003448904 20.1472193755373 20.1472193755373 21.480898497365338 21.480898497365338 22.814577619193372 23.13763280913664 23.47450681731535 24.870131969903245"

          y2="-7.190568953296931 -7.960585893855971 -9.500619774974052 -10.270636715533094 -9.500619774974052 -7.960585893855971 -10.270619774974051 -7.190585893855971 -7.960585893855971 -9.308086199031752 -11.040586237178726 -9.404336256252211"

          />

      <bondArray>

        <bond atomRefs2="a1 a2" order="1" />

        <bond atomRefs2="a2 a3" order="2" />

        <bond atomRefs2="a3 a4" order="1" />

        <bond atomRefs2="a4 a5" order="1" />

        <bond atomRefs2="a5 a6" order="1" />

        <bond atomRefs2="a1 a6" order="2" />

        <bond atomRefs2="a5 a7" order="1" />

        <bond atomRefs2="a6 a8" order="1" />

        <bond atomRefs2="a8 a9" order="1" />

        <bond atomRefs2="a9 a10" order="1" />

        <bond atomRefs2="a10 a11" order="1" />

        <bond atomRefs2="a10 a12" order="1" />

        <bond atomRefs2="a5 a10" order="1" />

      </bondArray>

    </molecule>

  </MChemicalStruct>

  <MRectangle id="o2" color="#ff0000" lineColor="#ff0000">

    <MPoint x="16.654127394673786" y="-4.824732821331423" />

    <MPoint x="26.664127623555622" y="-4.824732821331423" />

    <MPoint x="26.664127623555622" y="-12.28410820280115" />

    <MPoint x="16.654127394673786" y="-12.28410820280115" />

  </MRectangle>

  <MEFlow id="o3" arcAngle="-254.995522631729" headSkip="0.15"

          headLength="0.5" headWidth="0.4" tailSkip="0.25">

    <MEFlowBasePoint atomRef="m1.a4" />

    <MAtomSetPoint atomRefs="m1.a4 m1.a5" />

  </MEFlow>

  <MEFlow id="o4" arcAngle="248.39738999999997" headSkip="0.25"

          headLength="0.5" headWidth="0.4" tailSkip="0.15">

    <MAtomSetPoint atomRefs="m1.a5 m1.a7" />

    <MAtomSetPoint atomRefs="m1.a7" />

  </MEFlow>

</MDocument>

</cml>

Turn on lone pairs, and mouse over and around the structure.  See how the electron-flow arrow that begins at the pyridine N atom rapidly oscillates between two positions.  This behavior is inconsequential but very annoying.

Dear Bob,

I have rewritten a big part of the electronflow code, and now the handling of charges, lone pairs, and radicals are much better, and I hope all the jumping eflow problems - along with other problems  - are fixed. I have tested this bug and it was wrong in the current version (5.4.1), but will be good in the 5.5.

Best Regards,

Peter