problem with youtube on windows7 Rated 3 out of 5 stars

i have 2 computers, one with windows xp and the other with windows 7. vdh is still working fine with youtube on the windows xp os. vdh is not working on youtube on the windows 7 os. youtube vids do not load and a message says error occurred vid did not load try again. allow 3rd party cookies are enabled. no change. edit to add: when vdh is uninstalled from the firefox on windows 7 os, youtube vids load in firefox.
no change with new vdh vers. 4.9.13

This review is for a previous version of the add-on (  This user has 4 previous reviews of this add-on.