My system: Win7ultimate + Norton360 + AltBinz0.39.9
Working here: NZBIndex / Binsearch / NZB.su / NZB.cc / Yabse / NZBClub / Aeton.
Only working with SSL turned off: NZBSearch.
Not working: XPAT, Mysterbin (Ofcourse, it's closed).
It is probably a problem with your setup...
You could try to temporary disabling all firewalls/antivirus and try again.
Or post your system details and describe when the search engines stopped working for you. (Including error messages)