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Mani kadimiMani kadimi 

In the link below is a Video showing the error on Salesforce Front End we are trying to resolve. Please share your thoughts about the issue where the Calculate Payments popup does not load.https://www.dropbox.com/s/5re0s07wegei2vv/Salesforce%20Issue.mp4?d

Asif Ali MAsif Ali M
Seems like the main thread is using a Synchronous call which is deprecated. You can try changing the sync flag to true in the method that is making Schronous call.
https://www.salesforce.com/us/developer/ajax/beta1/js_docs_out/overview-summary-sforceclient.js.html