Last modified: 2014-01-13 09:06:39 UTC
When viewing an SVG image that has no background, the Viewer defaults the background to black. This makes any text on the page unviewable. Example: https://en.wikipedia.org/wiki/Wikipedia:WikiProject_National_Register_of_Historic_Places#mediaviewer/File:NRHP USA Map.svg/1
Thanks for taking the time to report this! Confirming. (to compare: https://upload.wikimedia.org/wikipedia/commons/thumb/c/cf/NRHP_USA_Map.svg/800px-NRHP_USA_Map.svg.png )
For SVG images a PNG thumbnail is displayed, so this is the same as #57620. *** This bug has been marked as a duplicate of bug 57620 ***