According to a Sprint community admin there is going to be an OTA fix being released from today and over a 4 day period, all the Epic 4g's should be patched and 3g upload issue fixed. There is no clue as to weather the patch will address anything else as yet but I am sure there will be a changelog to look at once the update has been released.
So if you received the recent update and got all excited that perhaps they had fixed the issue and then got disappointed that they didn't, please be disappointed any more. It is good to see Sprint addressing issues so quickly and listening to customer complaints. More carriers could learn from this.