There are a few things to try to get captcha working.
Option 1:
For Firefox, configure this first:
Tools> Options> Privacy: top drop menu set to "Firefox will use custom settings..."> Check 'Accept Cookies from sites'
â–ºUn-Check 'Accept 3rd Party cookies'
Go to the site needing cookies> copy that URL> Tools> options> Privacy> Exceptions> (paste that URL into slot)> Allow> Close.
"NoScript' users may have to "temporarily allow....." from the blue 'S' tray icon.
Supplemental blockers, in browsers mainly, may have to be muted, or 'site allowed'.
No need to relax any other cookie settings (which help deter junk ads, pop-ups', malware etc.):
Internet Explorer users, do this first (IE, pre-8, should NOT be used: to many 'broken' security aspects):
Tools> Internet options> Security> tick the "Internet" icon> Security level box> set slider to "Medium high"> OK out.
General cookie settings should be:
Tools> Internet Options> Privacy> Advanced: tick "Override..."; Allow 1st party cookies; Allow session Cookies â–ºBLOCK 3rd Party cookies> OK> OK.
Go to the site needing approval & copy the URL from address bar, then:
Tools> Internet Options> Privacy> Sites> paste that URL into top line> Allow> OK> OK.
The "Pop-up Blocker" may also need to be modified to accommodate the site.
Tools> Internet Options> Pop up blocker heading> Settings> repeat URL pasting into the slot> Close> OK.
Option 2 if using IE9:
Site to test if your IE9 can see the captcha is found here:
http://forum.covecube.com/entry/register
Option 3 if using IE9:
There is a new option in IE9 called "Tracking Protection" and if you leave it disabled (as it is by default), Captcha's will show up fine, 32 or 64 bit IE9.
But if Captcha doesn't show, just go to the gearbox button at top right of IE9, then choose "Safety", then "Tracking Protection" and "Disable", and Captcha will then work again.
Try em out and see what happens. The captcha is run through Google btw, same as the Covecube site. Sorry about the pre tags, didn't want to mess with br today.