I've rigged a model and applied automatic weights. I went into weight painting mode to touch up and refine the bendy parts, I selected the left thigh bone and applied mirror with topographical mirror.
This streak across the auto-weighted area stays in the same spot when I select the right thigh as shown here:
It seems like mirroring does not work, it pastes changes from one side to the other after the options become enabled. I've been fiddling a little bit with the options to find out how to edit the pre-existing weights and have the operations applied for the bone's siblings as well. I also note that when topographical mirror is not enabled, the changes are not even applied in any form to the other bone. I appreciate any help and information to help with this problem, or if I'm misconstruing some options and coming to bad conclusions.