Save button missing on User Account Edit form I have months old problem of missing "Save" button on the user account edit form. Which is annoying to the point that now I have to find the solution. 

I don't usually use account edit form since there is only one user. I have updated many modules and different cores but problem always remained there. Right now I am running latest core which is 7.23. And all modules are updated. This is a multilingual website.  

Since this problem has appeared I am unable to save any change in any user account. Please have a look on the image attached.
Please help.

Thanks.
Try disabling i18n synchronization module.

There is another question similar to yours. Save button missing from content type edit form
Problem: save button missing from content type edit form. Reason: bug in i18n synchronization module. Solution: none here, but...

There is another case where i18n synchronization causes an infinite loop and there is patch along the lines of

if (function_exists(i18n_sync)) i18n_sync(FALSE);


This is the link, the patch is at #3. https://drupal.org/node/1372500
Maybe that will help you to the right direction.