There are reports at two different WebmasterWorld threads of reporting issues at both AdWords and AdSense. Let's first tackle the AdSense reporting issue.
If you login and go to your reports manager link, you are taken to a 403 Forbidden error page. It looks like this:
I assume this AdSense bug will be resolved shortly. Forum discussion at WebmasterWorld.
The AdWords side is a bit more complicated. There are confirmed reports that when running a report at AdWords, it doesn't ever complete the report.
Yesterday I attempted to run a keyword performance report and was told it would take 15 minutes (!) to complete--however the report (as well as any I attempted to run subsequently) never completed. They just stayed hung up on 'Pending' status until I deleted them.
In addition, some people are noticing weird Japanese characters for previously run reporting dates.
Today I logged into my reporting center and for whatever reason the dates of all my previously run reports appear to be in JAPANESE. Literally.
AdWordsRep has confirmed the issue and said the engineers are "working towards a resolution."