I have been having problems with Ylandra for a few weeks with her ignores not working. I can't tell you exactly when it started, but it happened partway through Ebon Gate, because I had all the high striker messaging ignored, and then one morning I got up and the ignores weren't working. This persists across computers, and on new installations of stormfront.
The only "character affecting" thing that I did, that I can think of, besides having her beard woven into a pouch, was using the prize wall prize to get the pumpkin spice muffin. Is it possible that something with the summon custom script is affecting the data coming to the client? It doesn't happen on any of my other characters, and I have even tried exporting all Ylandra's highlights and such, and then importing one of the other characters' info, to no avail.
