[Bug 1792758] [NEW] Unity Launcher icons replaced by ?

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For a couple days now, on 18.10 fully updated, upon starting an app from the Unity launcher, the icon is replaced by a question mark. 
Logging out and back in brings the icons back, but they are replaced by the ? icon as soon as I launch an app.
I tried running "unity --reset-icons" which changed my icon theme to what I guess is the new theme, but problem is still present.

** Affects: glib2.0 (Ubuntu)
     Importance: Undecided
         Status: Fix Released

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Unity Launcher icons replaced by ?
https://bugs.launchpad.net/bugs/1792758
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