Chrome html5 score incorrect: objectstore blob/array buffer support not enabled

When running the html5test.com my install of chrome current (39) gives me a score of 508, it's supposed to be 512... for some reason two items under the storage section of the test show that they are not enabled, or compatible/supported, whatever you want to call it... those items are: objectstore blob support and objectstore array buffer support. They are supposed to work but do not. I am running Ubuntu AMD64 14.04 with all updates... using Chrome Browser version 39.0.2171.95 fully updated. Occasionally I run the test and it reports correctly but 90% percent of the time it does not. This is obviously a bug but I don't know how to 'name' it so that it can reported and checked out. I realize some of the problem with people filing multiple reports for the same bug occurs because not everyone know what to call the bug... can someone help? Thanks