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    <p>Hi,</p>
    <p>I'm working on the second one (freeze when opening the dialog).
      It's triggered by a race condition between map canvas (rendering)
      and relation reference (feature form).<br>
    </p>
    Bests<br>
    Matthias<br>
    <br>
    <div class="moz-cite-prefix">On 7/26/17 6:45 PM, Germán Carrillo
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CANaz7mxwN-QzEtU+dFMQApm+wS4p0Afjx2ix1W2d50a+EB5ebg@mail.gmail.com">
      <div dir="ltr">Hi Régis, 
        <div><br>
        </div>
        <div>I've experienced such behavior in master as well. </div>
        <div><br>
        </div>
        <div>In my case, using the Project Generator plugin [1] (which
          configures a QGIS project from Interlis models or
          PostgreSQL/PostGIS schemas and by default activates
          transaction groups), as soon as I finish digitizing a geometry
          and the attribute form is opening, QGIS freezes entirely and
          sometimes even crashes.</div>
        <div><br>
        </div>
        <div>See here [2] a backtrace of a QGIS crash.</div>
        <div><br>
        </div>
        <div>Regards, </div>
        <div><br>
        </div>
        <div>Germán </div>
        <div>--------------</div>
        <div>[1] <a
            href="http://plugins.qgis.org/plugins/projectgenerator/"
            moz-do-not-send="true">http://plugins.qgis.org/plugins/projectgenerator/</a></div>
        <div>[2] <a
href="https://gist.github.com/gacarrillor/6cfa023b447b7e161df4c70363357b2a"
            moz-do-not-send="true">https://gist.github.com/gacarrillor/6cfa023b447b7e161df4c70363357b2a</a></div>
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      <div class="gmail_extra"><br>
        <div class="gmail_quote">2017-07-26 10:07 GMT-05:00 Régis
          Haubourg <span dir="ltr"><<a
              href="mailto:regis.haubourg@gmail.com" target="_blank"
              moz-do-not-send="true">regis.haubourg@gmail.com</a>></span>:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div dir="ltr">Hi all, 
              <div>I'm facing QGIS freezes when using project with
                postgres transaction groups activated. </div>
              <div><br>
              </div>
              <div>I just open the project, switch layers to edition
                mode, and pan >> freeze.</div>
              <div><br>
              </div>
              <div>I can reproduce that on two different massive
                projects, (one is QGEP) but not on another one (QWAT). </div>
              <div><br>
              </div>
              <div>Has anyone seen that too? My goal is to reduce that
                to something reproducible and light, but it's a moving
                target right now. </div>
              <div><br>
              </div>
              <div>Cheers</div>
              <span class="HOEnZb"><font color="#888888">
                  <div>Régis  </div>
                </font></span></div>
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          </blockquote>
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        <br clear="all">
        <div><br>
        </div>
        -- <br>
        <div class="gmail_signature" data-smartmail="gmail_signature">
          <div dir="ltr">
            <div>
              <div dir="ltr">
                <div dir="ltr">
                  <div>-----------<br>
                  </div>
                  <div>   |\__  <br>
                    (:>__)(<br>
                       |/    <br>
                    Soluciones Geoinformáticas Libres                  
                             <br>
                    <a href="http://geotux.tuxfamily.org/"
                      target="_blank" moz-do-not-send="true">http://geotux.tuxfamily.org/</a><br>
                    <a href="http://twitter.com/GeoTux2" target="_blank"
                      moz-do-not-send="true">http://twitter.com/GeoTux2</a></div>
                  <div><a href="http://about.me/germancarrillo"
                      target="_blank" moz-do-not-send="true">http://about.me/germancarrillo</a><br>
                  </div>
                  <div>
                    <div><br>
                    </div>
                    <div><a
                        href="http://gis.stackexchange.com/users/4972/germ%c3%a1n-carrillo"
                        target="_blank" moz-do-not-send="true"><img
                          src="http://gis.stackexchange.com/users/flair/4972.png"
                          moz-do-not-send="true"></a></div>
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    </blockquote>
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