I have been trying for almost 1 hour 
Mohit on Live Chat told me that it was because cron jobs in progress and told me to try again in 10-15 minutes …
but until now still problem …
how long should i wait ?(
are you getting an error? even with a cron job running it should work, it may take a little longer than normal but should work.
ticket: CER-26077-777
I knew I’ll get faster response from here 
no error … it just loads forever right after i click “>>” on the page showing Billing Statement for the client.