Иногда происходит повреждение файла настройки программы
cr3.ini и текст открывается знаками вопроса.
Исправить ситуацию поможет замена этого файла из системы, в которой CoolReader работает нормально.
Если не удаётся найти этот файл, можно воспользоваться заменой текста этого файла:
cr3.ini
background.color.default=0x00FFFFFF
background.image.filename=/usr/share/cr3/backgrounds/bg_paper1.jpg
bookmarkedit.window.fullscreen=0
bookmarkedit.window.maximized=0
bookmarkedit.window.minimized=0
bookmarkedit.window.pos={396,139}
bookmarkedit.window.size={535,402}
cr3.app.start.action=0
cr3.file.props.font.size=22
crengine.autosave.bookmarks=1
crengine.bookmarks.icons=0
crengine.cache.filesize.min=1048576
crengine.cache.forced.filesize.min=65536
crengine.display.full.update.interval=1
crengine.display.inverse=0
crengine.display.turbo.update=0
crengine.doc.embedded.fonts.enabled=1
crengine.doc.embedded.styles.enabled=1
crengine.file.txt.preformatted=0
crengine.font.fallback.face=Noto Serif
crengine.font.size=24
crengine.footnotes=1
crengine.highlight.bookmarks=1
crengine.highlight.bookmarks.color.comment=#a08020
crengine.highlight.bookmarks.color.correction=#a04040
crengine.highlight.selection.color=#c0c0c0
crengine.hyphenation.directory=@algorithm
crengine.image.scaling.zoomin.block.mode=2
crengine.image.scaling.zoomin.block.scale=2
crengine.image.scaling.zoomin.inline.mode=2
crengine.image.scaling.zoomin.inline.scale=0
crengine.image.scaling.zoomout.block.mode=2
crengine.image.scaling.zoomout.block.scale=2
crengine.image.scaling.zoomout.inline.mode=2
crengine.image.scaling.zoomout.inline.scale=0
crengine.interline.space=80
crengine.page.header.chapter.marks=1
crengine.page.header.font.color=0xFF000000
crengine.page.header.font.face=Theano Modern
crengine.page.header.font.size=24
crengine.page.margin.bottom=5
crengine.page.margin.left=8
crengine.page.margin.right=8
crengine.page.margin.top=8
crengine.page.view.mode=1
crengine.progress.show.first.page=1
crengine.style.floating.punctuation.enabled=1
crengine.style.space.condensing.percent=50
font.antialiasing.mode=2
font.color.default=0x00000000
font.face.default=Century Schoolbook L
font.face.weight.embolden=0
font.gamma=1.0
font.hinting.mode=2
font.kerning.enabled=0
main.window.fullscreen=0
main.window.maximized=1
main.window.minimized=0
main.window.pos={3,34}
main.window.size={1003,540}
styles.annotation.align=text-align: justify
styles.annotation.font-size=font-size: 90%
styles.annotation.font-style=font-style: italic
styles.annotation.margin-left=margin-left: 1em
styles.annotation.margin-right=margin-right: 1em
styles.annotation.text-indent=text-indent: 1.2em
styles.cite.align=text-align: justify
styles.cite.font-style=font-style: italic
styles.cite.margin-bottom=margin-bottom: 0.3em
styles.cite.margin-left=margin-left: 1em
styles.cite.margin-right=margin-right: 1em
styles.cite.margin-top=margin-top: 0.3em
styles.cite.text-indent=text-indent: 1.2em
styles.def.align=text-align: justify
styles.def.color=
styles.def.font-face=
styles.def.font-size=
styles.def.font-style=
styles.def.font-weight=
styles.def.line-height=
styles.def.margin-bottom=margin-bottom: 0em
styles.def.margin-left=margin-left: 0em
styles.def.margin-right=margin-right: 0em
styles.def.margin-top=margin-top: 0em
styles.def.text-decoration=
styles.def.text-indent=text-indent: 1.2em
styles.def.vertical-align=
styles.epigraph.align=text-align: left
styles.epigraph.font-style=font-style: italic
styles.epigraph.margin-bottom=margin-bottom: 0.3em
styles.epigraph.margin-left=margin-left: 15%
styles.epigraph.margin-right=margin-right: 1em
styles.epigraph.margin-top=margin-top: 0.3em
styles.epigraph.text-indent=text-indent: 1.2em
styles.footnote=font-size: 70%
styles.footnote-link.font-size=font-size: 70%
styles.footnote-link.vertical-align=vertical-align: super
styles.footnote-title=font-size: 110%
styles.link.text-decoration=text-decoration: underline
styles.poem.align=text-align: left
styles.poem.font-style=font-style: italic
styles.poem.margin-bottom=margin-bottom: 0.3em
styles.poem.margin-left=margin-left: 15%
styles.poem.margin-right=margin-right: 1em
styles.poem.margin-top=margin-top: 0.3em
styles.poem.text-indent=text-indent: 0em
styles.pre.align=text-align: left
styles.pre.font-face=font-family: "Courier New", "Courier", monospace
styles.pre.margin-bottom=margin-bottom: 0em
styles.pre.margin-left=margin-left: 0em
styles.pre.margin-right=margin-right: 0em
styles.pre.margin-top=margin-top: 0em
styles.pre.text-indent=text-indent: 0em
styles.subtitle.align=text-align: center
styles.subtitle.font-style=font-style: italic
styles.subtitle.margin-bottom=margin-bottom: 0.2em
styles.subtitle.margin-top=margin-top: 0.2em
styles.subtitle.text-indent=text-indent: 0em
styles.text-author.font-style=font-style: italic
styles.text-author.font-weight=font-weight: bolder
styles.text-author.margin-left=margin-left: 1em
styles.title.align=text-align: center
styles.title.font-size=font-size: 110%
styles.title.font-weight=font-weight: bolder
styles.title.margin-bottom=margin-bottom: 0.3em
styles.title.margin-left=margin-left: 0em
styles.title.margin-right=margin-right: 0em
styles.title.margin-top=margin-top: 0.3em
styles.title.text-indent=text-indent: 0em
toc.window.fullscreen=0
toc.window.maximized=0
toc.window.minimized=0
toc.window.pos={383,208}
toc.window.size={537,385}
window.fullscreen=0
window.landscape.pages=1
window.menu.show=0
window.rotate.angle=0
window.scrollbar.show=0
window.status.battery=0
window.status.battery.percent=1
window.status.clock=1
window.status.line=0
window.status.pos.page.count=1
window.status.pos.page.number=1
window.status.pos.percent=1
window.status.title=1
window.statusbar.show=0
window.style=fusion
window.toolbar.size=0
