I don't think it is caused by the system running low on memory. I saw this 
issue this morning on arale and the system has plenty of memory free:
             total       used       free     shared    buffers     cached
Mem:       1937952    1327364     610588      31468      11028     254584
-/+ buffers/cache:    1061752     876200
Swap:       524284          0     524284

There are these suspicious lines in .cache/upstart/unity8-dash.log

QNetworkReplyImplPrivate::error: Internal problem, this method must only be 
called once.
file:///usr/share/unity8//Components/LazyImage.qml:91:16: QML Image: Cannot 
open: file:///usr/share/unity8//Dash/Previews/broken_image
file:///usr/share/unity8//Components/LazyImage.qml:91:16: QML Image: The 
specified configuration cannot be used.
file:///usr/share/unity8//Dash/Previews/PreviewImageGallery.qml:82: Error: 
Cannot assign [undefined] to QUrl
file:///usr/share/unity8//Components/LazyImage.qml:91:16: QML Image: The 
specified configuration cannot be used.
file:///usr/share/unity8//Dash/Previews/PreviewImageGallery.qml:82: Error: 
Cannot assign [undefined] to QUrl
file:///usr/share/unity8//Dash/Previews/PreviewImageGallery.qml:124:23: QML 
QQuickImage: The specified configuration cannot be used.
file:///usr/share/unity8//Dash/Previews/PreviewImageGallery.qml:138: Error: 
Cannot assign [undefined] to QUrl
file:///usr/share/unity8//Dash/Previews/PreviewImageGallery.qml:124:23: QML 
QQuickImage: The specified configuration cannot be used.
file:///usr/share/unity8//Dash/Previews/PreviewImageGallery.qml:138: Error: 
Cannot assign [undefined] to QUrl
file:///usr/share/unity8//Dash/Previews/PreviewHeader.qml:81:28: QML 
QQuickImage: The specified configuration cannot be used.

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https://bugs.launchpad.net/bugs/1507769

Title:
  App store does not display images when system memory is low

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