Unable to delete cookies for individual websites

Am running Firefox 29 on Windows 8.1 64 bit.
This arose because a particular website was having difficulty setting a cookie (I think) - FF was giving the error that the website server was redirecting the request in a way that couldn't be completed - but with the caveat that it could be caused by cookies not being permitted. So I tried deleting the cookie for that particular website but FF seems not to comply. It is removed from the list of cookies in the dialog box and I can close the dialog, however if I reopen it the cookie it still shown as present. Doing it a second time doesn't help.
I then found that this doesn't just apply apply to one particular website, it's any website that stores a cookie. Cookies are set to be deleted when they expire as I find it useful for some website to store cookies (I can't seem to find a whitelist which allows cookies to be deleted except for those on the whitelist, this in contradistinction to the blacklist which prevent certain websites from setting cookies at all).
I've tried the following:
(1) open FF in safe mode but I get the same result (cookie not deleted)
(2) with FF closed rename the cookies.sqlite file out of the way. Starting then with a "clean" cookie file I still get the same result (cookie not deleted).
I can confirm the cookie isn't deleted by quickly opening the cookies.sqlite and searching for the website string.
I have tried setting FF cookie "policy" to remove all at the end of session and that works - but it also removes the useful ones as well. Does anyone have some ideas?

'''''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]'''''
 While you are in safe mode; 
'''''Firefox Options > Advanced > General'''''. 
Look for and turn off '''Use Hardware Acceleration'''. 
Poke around safe web sites and see if there is still a problem. Then restart.

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Unable to delete cookies for individual websites

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