Your comments

No problem and thanks for getting back to me. 
George
Many thanks Jennifer.  I will eagerly await your news about the original machine to nail this one.
I am adding one free shipping coupon to your account, as a small token of thanks for your contribution to our effort.

George
Thanks Jennifer,
It is hard to hide it!
One last question if you please, because I asked you to try two things and it is important for us to know which one worked. 
Can you now work the site from your original computer where you encountered the problem?

George
Jennifer,

Thanks for the input you gave.
I have disabled the social add-ons for your account, as I suspect that it is these that cause the problem.  Would you be kind enough to try again please?

George
I agree with you that it is not the browsers.  I see the attempts and I see the session cookies being accepted.  And from the way you report,  I trust that you handle cache, private browsing and update issues fine.  Really strange as we have users operating with these browsers. 

If you still have the patience to pursue this, can you try from another computer when you have the chance?   I would love to get to the bottom of this.

George
Hi Elizabeth,

We made some changes on our side in an effort to alleviate the post-login problem you are facing.
Would you like to give it another try?

George
We are here to help! 
Please do not hesitate to ask any questions that may arise.

Happy mulit-way Swapping!
George
Tekisha,

I managed to duplicate the behavior with the image you gave me.
Would you be kind enough to try again?  You should be ok now.

Apologies for the incident and thank you for your perseverance.
George
Thanks,

Your account seems to be in order and the browser seems to respond fine.
Would you mind sending me one of the pictures you cannot upload at george@swapdom.com ?
Do you get any error messages after your attempts?

George