The link you have for the signature image is incorrect.
You have: http://https//boincstats.com/signature/-1/user/35497443578/sig.png
ELIMINATE THE "https://" in between the"img" tag as noted below...
Edit >>> Note to PimeGrid admins:-- https signature images do not load here at Prime Grid forums - just placeholders. Https sig's works OK at SETI and other projects