Try clicking on the green dot and change the server. If it doesn't work, click on the transaction>details>save to somewhere. Next, you can open it(the .txn file) with notepad or any text reader. You should get something like:
{
"hex": "0100averylongstringoftext",
"complete": true
}
.
Copy the text in the brackets after the hex:, go to
https://coinb.in/#broadcast and paste everything in and press broadcast.
I suspect that it might be because of the fees that you have paid. What is the details of the transaction (the fees paid, transaction size etc.)?