Elements Agent stuck on Detecting Changes in PSE13

Question

I am running PSE13 on a Windows 8.1 desktop.
My photo catalogue has about 40K pictures, but only 3K have been uploaded from PSE13 to Revel.  The Elements Agent is stuck on "Detecting Changes" and not synchronizing with Revel.
I have signed out/in within PSE13 and turned the Elements Agent off and then on.  Still no changes.
On my desktop, I have turned off all services and startup programs except for Adobe programs.
Looking for help.

Answer 1

Thanks a lot for replying, your example is being of help but
i think you misunderstood my post and i still have some doubts.
More than one item can be a winner, not just one, so i will
have to call an update for each item.
On my fill method i have something like this:
public List fill(List fillParameters){
List results = new ArrayList();
results = dao.getBids();
results = checkWinners(results); //this function checks each
item and sets the winner porperty to true or false.
return results;
So when i call on Flex DataService.fill() it obtains the list
of bids and each has its winner property to true or false. Then i
insert a new item and the fill method is executed again (due to
autoRefreshFill) and winner properties is set again but the
updateCollection message only includes the new added item, it
doesn't check for updates.
So now, the real deal is where would i call the updateItem to
push the changes? Should i call the updateItem inside the
createItem function? on the refreshFill function? inside the fill
function?
I have checkWinners() function which is the one i call inside
the fill function and that sets the winner property of each item,
should i call the DataServiceTransaction.updateItem from there? I
have my doubts because i am calling this function inside the fill
method.
So it all sums up in "where should i call the updateItem?"
Thanks for you help, hope you can help me out with this last
issue :)