a. In this page, password field fills automatically, but username doesn't. I think you can try, even with fake users.
https://www.invertironline.com/User/Login?currentUrl=%2FMiCuenta%2FMiPortafolio
b. I try with a clean install, and CTRL-F1 problem was fixed. Thanks!
c. Find problem is intermitent. I'll try to get some dump log next time.