Hi,
I just made a test, I logged in your site, from "User" icon top-right, and after login I was redirected to a blank page. That page is not visible because the "HTML" tag from source page is hidden:
/ K2 - Magnific Popup Overrides /
.mfp-iframe-holder {padding:10px;}
.mfp-iframe-holder .mfp-content {max-width:100%;width:100%;height:100%;}
.mfp-iframe-scaler iframe {background:#fff;padding:10px;box-sizing:border-box;box-shadow:none;}
html { display:none }
I can not replicate your issue, even if I am logged in your site and set page html tag visible, I can not see that menu Item - "MY PROFILE"
Kind Regards,
Alin