Mirror page not loading consistently all the time in v8 Adobe campaign classic
We recently migrated to v8 from ACC v7. We have observed many times that when we create an email delivery the mirror page doesn't load when we try to view the same from the delivery object. However when we send out the email and click the mirror page in the email it loads properly. This is not consistent but works some time in delivery object. It looks like the mirror page is getting calculated incorrectly as I see always one mid-source URL (ex: m19) however in the email it is other one (ex: m20). When both are same (ie. m19) then it works in delivery object too.
How can this be corrected? Is there a way to assign right mid-source URL to the mirror page?
Thanks in advance!