Project: QGIS
Version: 2.12.0
QGIS 2.12 fixes a number of issues regarding the handling of outlines within SVG marker and SVG fill symbols.
Previous versions of QGIS would render the outlines at a significantly smaller size than set, and drawing SVGs with outline sizes in map units was broken.
These issues have been fixed in QGIS 2.12, but as a result you may need to update your project symbology if you've previously set oversized outlines for your symbols to overcome these bugs. In the image you see QGIS 2.12 vs QGIS 2.10 SVG markers in the symbol layer dialogs.
