Preview failure

Glennfrancis · Yesterday, 01:57 AM

Running Sigil 2.3.0 on an old, but up to date Windows 10 PC, and when I try to open the Sigil User Guide (for example; I assume this will run in Sigil…seems like a reasonable assumption/test case

) the Preview window will very briefly display an item, like the cover, when the Update Preview Window button is pressed, but only for a single second. Same goes for any other content from the User Guide: appears for a second in the Preview window, and then vanishes.
Any other doc I’ve loaded (like the book I’m working on, which displays a TOC just fine) I have no preview at all of. I’ve searched high and low for a clue about what’s going on, but no joy. Am I simply doing something dumb that’s causing this?

BetterRed · Yesterday, 04:44 AM

Working fine here: Sigil 2.3.0 Win 10.

Which version of the User Guide? Latest is here ==> Sigil User Guide - Sigil-Ebook

BR

DiapDealer · Yesterday, 06:38 AM

Try ticking the box in Sigil's preferences to disable hardware acceleration in Qt/WebEngine. The guide has tons of images and has embedded fonts. Aging hardware and the newer Qt6 in Sigil 2.3.0 are likely combining to cause problems.

Glennfrancis · Yesterday, 07:17 PM

Thanks. Made the preferences change, but the problem persists after restart. I would prefer that “aging hardware,” much as it makes sense, not be the only remaining diagnosis; any other ideas?

KevinH · Yesterday, 07:32 PM

You may have an anti-virus program that is interfering with the QWebEngineProcess application that runs behind the scenes.

You may have a firewall setting that interferes with even local sockets to prevent inter-process communications.

You may have an unsupported graphics driver. Have you tried updating to the very latest driver for your graphics card?

Fire up Sigil and load the Users Guide and navigate to any page. Even if Preview is blank, try hitting the Inspector button on the Preview Toolbar. Does the Inspector open? Can you see anything? If so, look at the source code via Preview's Inspector, Does it look similar to what CodeView is showing (after uncollapsing the code whereneeded).

It you see it just for a flash and it goes away, then something is interfering with Qt's QWebEngine, most probably really misguided anti-virus software.

Perhaps your aging processor does not support AVX or other advanced registers required?

DiapDealer · Yesterday, 08:51 PM

After eliminating anti-virus as the culprit, try creating an environment variable named QSG_RHI_BACKEND and setting its value to "opengl" (no quotes), and then launch Sigil. This should eliminate the possibility that your d3d11 (now the default) implementation is not quite up to snuff by forcing all QtQuick stuff to use opengl instead.

KevinH · Yesterday, 09:41 PM

And then there is this bug related to CPUs without AVX and SSE4 which causes the QtWebEngine render process to crash.

https://bugreports.qt.io/browse/QTBUG-123811

So does you older hardware cpu support AVX and SSE4?

Yesterday, 01:57 AM	#1
Glennfrancis Junior Member Posts: 2 Karma: 10 Join Date: Aug 2024 Device: None	Preview failure Running Sigil 2.3.0 on an old, but up to date Windows 10 PC, and when I try to open the Sigil User Guide (for example; I assume this will run in Sigil…seems like a reasonable assumption/test case) the Preview window will very briefly display an item, like the cover, when the Update Preview Window button is pressed, but only for a single second. Same goes for any other content from the User Guide: appears for a second in the Preview window, and then vanishes. Any other doc I’ve loaded (like the book I’m working on, which displays a TOC just fine) I have no preview at all of. I’ve searched high and low for a clue about what’s going on, but no joy. Am I simply doing something dumb that’s causing this?

Yesterday, 06:38 AM	#3
DiapDealer Grand Sorcerer Posts: 27,792 Karma: 198099188 Join Date: Jan 2010 Device: Nexus 7, Kindle Fire HD	Try ticking the box in Sigil's preferences to disable hardware acceleration in Qt/WebEngine. The guide has tons of images and has embedded fonts. Aging hardware and the newer Qt6 in Sigil 2.3.0 are likely combining to cause problems. Last edited by DiapDealer; Yesterday at 10:07 AM.

Yesterday, 07:17 PM	#4
Glennfrancis Junior Member Posts: 2 Karma: 10 Join Date: Aug 2024 Device: None	Preview failure Thanks. Made the preferences change, but the problem persists after restart. I would prefer that “aging hardware,” much as it makes sense, not be the only remaining diagnosis; any other ideas?

Yesterday, 07:32 PM	#5
KevinH Sigil Developer Posts: 7,972 Karma: 5449552 Join Date: Nov 2009 Device: many	You may have an anti-virus program that is interfering with the QWebEngineProcess application that runs behind the scenes. You may have a firewall setting that interferes with even local sockets to prevent inter-process communications. You may have an unsupported graphics driver. Have you tried updating to the very latest driver for your graphics card? Fire up Sigil and load the Users Guide and navigate to any page. Even if Preview is blank, try hitting the Inspector button on the Preview Toolbar. Does the Inspector open? Can you see anything? If so, look at the source code via Preview's Inspector, Does it look similar to what CodeView is showing (after uncollapsing the code whereneeded). It you see it just for a flash and it goes away, then something is interfering with Qt's QWebEngine, most probably really misguided anti-virus software. Perhaps your aging processor does not support AVX or other advanced registers required? Last edited by KevinH; Yesterday at 07:38 PM.

Yesterday, 08:51 PM	#6
DiapDealer Grand Sorcerer Posts: 27,792 Karma: 198099188 Join Date: Jan 2010 Device: Nexus 7, Kindle Fire HD	After eliminating anti-virus as the culprit, try creating an environment variable named QSG_RHI_BACKEND and setting its value to "opengl" (no quotes), and then launch Sigil. This should eliminate the possibility that your d3d11 (now the default) implementation is not quite up to snuff by forcing all QtQuick stuff to use opengl instead. Last edited by DiapDealer; Yesterday at 08:55 PM.

Yesterday, 04:44 AM	#2
BetterRed null operator (he/him) Posts: 20,817 Karma: 27405122 Join Date: Mar 2012 Location: Sydney Australia Device: none	Working fine here: Sigil 2.3.0 Win 10. Which version of the User Guide? Latest is here ==> Sigil User Guide - Sigil-Ebook BR

Yesterday, 09:41 PM	#7
KevinH Sigil Developer Posts: 7,972 Karma: 5449552 Join Date: Nov 2009 Device: many	And then there is this bug related to CPUs without AVX and SSE4 which causes the QtWebEngine render process to crash. https://bugreports.qt.io/browse/QTBUG-123811 So does you older hardware cpu support AVX and SSE4? Last edited by KevinH; Yesterday at 09:52 PM.

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