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I decided to run Iagno from terminal and get errors related to few stylesheets:

(iagno:17841): Gtk-WARNING **: Theme parsing error:
gtk-widgets.css:85:17: Not using units is deprecated. Assuming 'px'.

Same for nautilus.css, nemo.css, unity.css, epiphany.css

How to resolve this trouble? (and occasionally Iagno lockups)

Sometimes program locks interface and uses almost 100% CPU to resolving next pass.

and also sadly wrong in algebra, i'm sorry

*Iagno wrong in algebra*

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These are warnings and probably not causing any lockups. –  gertvdijk Nov 30 '12 at 13:27
no problem ... but Iagno lockups is real :D –  swift Nov 30 '12 at 13:28
what version of light-themes you are using ? –  raaz Nov 30 '12 at 13:35
gdm, gtk+, gnome-shell ... –  swift Nov 30 '12 at 13:37
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