<html><body><div>Hi Christian,</div><div dir="ltr"><br></div><div>I attached the Debugging Guide for your problem in QGIS. I hope it will be helpful to you, let me know.</div><div dir="ltr"><br></div><div dir="ltr" style="font-family: Aptos, Aptos_MSFontService, -apple-system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Best regards,</div><div id="ms-outlook-mobile-body-separator-line" data-applydefaultfontstyles="true" style="font-family: Aptos, Aptos_MSFontService, -apple-system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt;" dir="ltr"><div dir="ltr" style="font-family: Aptos, Aptos_MSFontService, -apple-system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt;"><br></div></div><div style="font-family: Aptos, Aptos_MSFontService, -apple-system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt;" id="ms-outlook-mobile-signature"><div style="text-align: left; text-indent: 0px; text-transform: none; font-family: Aptos, Aptos_MSFontService, -apple-system, Roboto, Arial, Helvetica, sans-serif; font-size: 14px; color: rgb(0, 0, 0);"><b>Vladimir Vuković </b></div><div style="text-align: left; text-indent: 0px; text-transform: none; font-family: Aptos, Aptos_MSFontService, -apple-system, Roboto, Arial, Helvetica, sans-serif; font-size: 13px; color: rgb(0, 0, 0);">Author of FiberQ </div><div style="text-align: left; text-indent: 0px; text-transform: none; font-family: Aptos, Aptos_MSFontService, -apple-system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> </div><div style="text-align: left; text-indent: 0px; text-transform: none; font-family: Aptos, Aptos_MSFontService, -apple-system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt;"><span style="color: rgb(17, 17, 17);"><a href="mailto:vukovicvl@fiberq.net" data-ogsc="rgb(17, 17, 17)" data-linkindex="3" style="text-decoration: none;">vukovicvl@fiberq.net</a></span><span style="color: rgb(0, 0, 0);"><br></span><span style="color: rgb(17, 17, 17);"><a href="https://fiberq.net/" data-ogsc="rgb(17, 17, 17)" data-linkindex="4" style="text-decoration: none;">fiberq.net</a></span><span style="color: rgb(0, 0, 0);"><br></span><span style="color: rgb(17, 17, 17);"><a href="tel:+381604262012" data-ogsc="rgb(17, 17, 17)" data-linkindex="5" style="text-decoration: none;">+381 60 426 2012</a></span></div><div dir="ltr" style="font-family: Aptos, Aptos_MSFontService, -apple-system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><img src="cid:signature-image-13514818-43F3-4268-BD26-7FE1DE83B5BC" alt="signatureImage" id="id-signature-image-13514818-43F3-4268-BD26-7FE1DE83B5BC" style="max-width: 100%;"></div></div><div id="mail-editor-reference-message-container"><hr style="display: inline-block; width: 98%;"><div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif;"><b>From:</b> QGIS-User <qgis-user-bounces@lists.osgeo.org> on behalf of Christian Barthel via QGIS-User <qgis-user@lists.osgeo.org><br><b>Sent:</b> Friday, January 9, 2026 11:33 AM<br><b>To:</b> qgis-user@lists.osgeo.org <qgis-user@lists.osgeo.org><br><b>Subject:</b> [Qgis-user] Loading older Qgis project stalls / unresponsive UI</span><div style="font-family: Calibri, sans-serif;"> </div></div>Hi, I am trying to load some older Qgis projects (3.22.16, Debian
<br>12) with a newer Qgis version (3.40.6 on Debian 13). The message
<br>"Project file is older" is shown at the top and for some
<br>projects, Qgis just "hangs" and it seems to do nothing (strace
<br>shows a futex() system call and nothing is changing anymore).
<br>Qgis is totally unresponsive and I had to kill the app then.
<br>
<br>Is there some way to debug this problem?
<br>How can I find out why my projects are not loaded?
<br>
<br>I know that there are layers for which the data source is no
<br>longer available but usually there was a message where I can
<br>ignore those. The Project file is a readable xml, though I
<br>wonder if I should try to remove some of the layers manually?
<br>
<br>Thanks!
<br>
<br>--
<br>Christian Barthel
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