Over the weekend and on Friday, many Google AdWords users began complaining they could not login to their AdWords account.
Google posted a thread at the Google AdWords Help forum that this is a known issue. In fact, AdWords representative Bindu posted a work around saying you can go to https://adwords.google.com/cm/CampaignMgmt to access your account. Bindu said:
We are aware that there are some accounts affected by a technical issue which is preventing them from accessing their AdWords account. Please be assured that our Engineering team are working to resolve this as a high priority and we hope to have it fixed very soon.In the meantime, as a workaround we recommend logging into your account via https://adwords.google.com/cm/CampaignMgmt as this will avoid the issue.
However, this morning or earlier, Google seemed to have resolved the issue.
Google moved this known issue to the "recently fixed" box.
Forum discussion at Google AdWords Help.

Comments:
Cthurz
06/13/2011 09:06 pm
AdWords was working fine on Friday till it just dropped out, then unable to get back into AdWords! Even today 6-13-11, I tried your link: https://adwords.google.com/cm/CampaignMgmt , Home page finally came up, I logged in then it went to no where??? I hate to tell you you've fixed NOTHING???
PayPerPl8
07/13/2011 10:29 am
Can't get in for the last 24 hrs
Sdasdas
09/08/2011 12:53 am
This is still not fixed
Gc
04/11/2012 05:43 pm
april 11 12:30 pm Still broke!