Adding Web content is not working

Hi,

I used to use iframe to embed web content in a dashboard, which worked well. 

Recently, it is not working anymore. Below is the embeded code:

<iframe width=100% height="515"
src="https://jira.xxxxxxxx/jira/secure/Dashboard.jspa?selectPageId=xxxx" frameborder="0"
allowfullscreen></iframe>

Please help!! Thanks a lot!