chriseppstein/compass — Issue #696: filter-gradient only accepts color values with either 3 or 6 digits
Author: sgalinski
Created: 2012-02-02 16:13:27+00:00
State: open

Problematic Code:
filter-gradient(#19000000, #19000000);

The alpha value is required if you want to use the rgba hack for IE.

http://css-tricks.com/rgba-browser-support/