AdWords API Re: Custom reports frustration with internal server error

the details i pass in the headers are the email and pass for the mcc.
Once i request a report for a specific account by passing the email and
pass of it it works. But i can't understand why the crossclient stoped
working (now i remember it's from 2-3 days ago when i had also tables
with no records in my db). What has changed in AdWords? I went over the
whole forum and have tried alsmost all!