This is very odd and I have not seen another post for the same issue.
I have just started configuring GTS 11.0. For some reason the basis guys couldn't get the upgrade to work through solution manager so I am starting from scratch (although I don't think that is the issue)
Anyway I have made the basic settings involved and on Thursday 11/5/2015 I was able to initially transfer a handful of materials, customers and vendors.
Today 11/9/2015 when I try to transfer additional ones I am getting the pop-up that they have transferred successfully via the plug in but there is nothing in the logs in GTS or in the ECC sandbox.
We tried resetting both servers but I still get the same message that the transfer was successful but they aren't transferring.
Has anyone run into a similar problem?