Comment 1 for bug 1052353

haven't dug into the underlying engine but found a couple of items that are related and could be patched on either the engine or the theme side -- got tired of seeing all the errors so I tinkered with the css for a few minutes

when using 0 as a size in standard css it is rendered as 0px
when 0 is found in a gtk theme it raises an error

patch: replace all 0; and 0 (0 space) with 0px

text-shadow: this one is just funky -- haven't been able to find a setting that doesn't raise an error besides commenting out
box-shadow: same

documentation says that the shadow setting support the inset function only -- doesn't seem true since no matter how I adjust them they keep raising errors

not a great help but might provide a pointer for someone else getting tired of huge error log files

themes are located in /usr/share/themes/

you can grep | sed the updates globally or edit manually (safer)

recap: replace any size reference of 0 to 0px -- comment out all text-shadow & box-shadow lines
doesn't fix the bugs but makes the parsing engine happier