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Hi,<br>
<br>
I got a sporadic error message<br>
<br>
NotImplementedError: QGraphicsItem.paint() is abstract and must be
overridden<br>
<br>
The error is not reliably reproducible at the same location or the same
sequence of operations.<br>
<br>
Anybody any suggestions on what is happening or what one has to do
about it?<br>
<br>
Thanks Heinz<br>
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<title>business</title>
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      <td style="width: 50%; vertical-align: top;"><span
 style="font-weight: bold;">Heinz A Preisig</span><br>
Professor of Process Systems Engineering</td>
      <td style="width: 50px; vertical-align: top;"><span style=""
 lang="EN-US">Private: <br>
&Oslash;vre Bakklandet 62 B, 7013 Trondheim, Norway<br>
      </span></td>
    </tr>
    <tr>
      <td style="vertical-align: top;"><span style="font-style: italic;">Department
of Chemical Engineering</span><br>
      <div style="text-align: left;"><span
 style="font-weight: bold; font-style: italic;"></span><span
 style="font-weight: bold; font-style: italic;">Norwegian
University of Science and
Technology&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; </span><span
 style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"></span><br>
      </div>
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 style="font-weight: bold; font-style: italic;"></span><span
 style="font-style: italic;">N &#8211; 7491 Trondheim, Norway</span></td>
      <td style="vertical-align: top;">Tel direct:<span style="">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
      </span> <span style="" lang="EN-US">+47&nbsp;<span style="">&nbsp; </span><span
 style="">&nbsp; </span>735
92807<span style=""><br>
      </span></span><span style="" lang="EN-US">Tel mob:<span style="">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
      </span> +47 <span style="">&nbsp;&nbsp;&nbsp; </span>9754
1334<br>
      </span><span style="" lang="EN-US">e-mail:<span style="">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
      </span><a href="mailto:Heinz.Preisig@chemeng.ntnu.no">Heinz.Preisig@chemeng.ntnu.no</a><br>
      </span><span style="" lang="EN-US">web:<span style="">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
      </span><a href="http://www.chemeng.ntnu.no/%7Epreisig">www.chemeng.ntnu.no\~preisig</a></span></td>
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&nbsp;
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