It does look like that answer definitely fixed the problem for the OP, since he commented on the answer first, then accepted the answer later (mouse over the timestamps to see the sequence of events in UTC time).
I agree the presence of the accepted answer is problematic; if the accepted answer wasn't there, I'd say ...
bump that question up with votes and a comment [ed: actually an edit is necessary]
... but since it is, I think you have no choice but to ...
open another question that notes that I have tried all the ideas from the other one with no success
... and link to the older question, obviously.
There's actually a third path here but it is much harder:
figure out the solution to your problem on your own, and post it as another answer on the question
It's probably OK to have two linked questions here, so long as the text of the question is different enough to attract people who search using different terms for the same problem, etc.