Just to update this thread with info from another thread:

We think we know what's happening. This is something that is happening at
app upload time. Can you try setting a new version name for your app, then
passing the --no_batch option when using appcfg.sh?

appcfg.sh --no_batch update [YOUR_WAR_DIRECTORY]

2012/1/10 Iván Rodríguez <[email protected]>

> -1000 10 minutes later the css is off, what fucking is this?
>
> El 10 de enero de 2012 12:23, Iván Rodríguez <[email protected]>escribió:
>
> +1
>>
>>
>> 2012/1/10 Janeane Foster <[email protected]>
>>
>>> Great tip Amy
>>>
>>> Thanks
>>> On Jan 9, 2012 11:12 PM, "Amy Unruh" <[email protected]> wrote:
>>>
>>>> For those affected, it looks like a workaround is to add the following
>>>> to your web.xml:
>>>>
>>>> <mime-mapping>
>>>>  <extension>css</extension>
>>>>  <mime-type>text/css</mime-type>
>>>> </mime-mapping>
>>>>
>>>>
>>>>
>>>> On Tue, Jan 10, 2012 at 4:44 AM, Mos <[email protected]> wrote:
>>>>
>>>>> Hello GAE-Team,
>>>>>
>>>>> no news in 24h on this critical issue?
>>>>>
>>>>> I'm new to GAE and we will release our first application the next days.
>>>>> But this issue make me loose my confidence in GAE's reliability. I
>>>>> get doubt if Google App Engine was the right choice?
>>>>>
>>>>> As Jon mentioned: The issue is around on this list for more than two
>>>>> weeks.
>>>>> The issue breaks applications --> downtimes for more and more of your
>>>>> GAEs users
>>>>>
>>>>> And what I'm really wondering:
>>>>> It seems to be a simple fix on the GAE-Frontends. It shouldn't be such
>>>>> a complex thing,
>>>>> to evaluate why the response header sends a null mime-type and not the
>>>>> css mime-type for some
>>>>> application's  *.css files? You have more then one test-case on
>>>>> this....
>>>>> Your GAE guys are so smart and can't fix this one?
>>>>>
>>>>> Cheers
>>>>> Mos
>>>>>
>>>>>
>>>>>
>>>>> On Sun, Jan 8, 2012 at 11:15 PM, Amy Unruh <[email protected]>wrote:
>>>>>
>>>>>> Mos (and others),
>>>>>>
>>>>>> The issue is being actively investigated; we'll be sure to update
>>>>>> this thread and the issue page as soon as there is more to report.
>>>>>> Mos, you can go ahead and re-deploy if you want, as we have other
>>>>>> test cases as this point.
>>>>>>
>>>>>>  -Amy
>>>>>>
>>>>>>
>>>>>> On Mon, Jan 9, 2012 at 5:00 AM, Mos <[email protected]> wrote:
>>>>>>
>>>>>>> Hello Ikai,
>>>>>>>
>>>>>>> did you have the chance to evaluate on the issue?
>>>>>>> I sent you my broken test version / URL  two days ago.
>>>>>>>
>>>>>>> I wanna redeploy in near future, but don't want to destroy "your
>>>>>>> test-case".
>>>>>>>
>>>>>>> Please give some feedback.
>>>>>>>
>>>>>>> Further I think we should put the issue on critical, because this
>>>>>>> bug breaks
>>>>>>> webpages and many people are affected:
>>>>>>>
>>>>>>> http://code.google.com/p/googleappengine/issues/detail?id=6655
>>>>>>>
>>>>>>> Cheers
>>>>>>> Mos
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Fri, Jan 6, 2012 at 12:26 PM, Mos <[email protected]> wrote:
>>>>>>>
>>>>>>>> Hi Ikai,
>>>>>>>>
>>>>>>>> the problem occurs in all browsers (I tested Firefox, Chrome and
>>>>>>>> IE).
>>>>>>>> All browsers get a mime-type of null.
>>>>>>>> Firefox is able to interpret the stylesheet nevertheless. IE and
>>>>>>>> Chrome fail and the site is destroyed.
>>>>>>>>
>>>>>>>> Since yesterday I have a version of my application that still has
>>>>>>>> the problem.
>>>>>>>> I sent you the URL and the Beta-Login in a private email.
>>>>>>>>
>>>>>>>> I need to redepoy at the weekend, so please check it in the next
>>>>>>>> hours.
>>>>>>>>
>>>>>>>> Greetings Mos
>>>>>>>>
>>>>>>>>
>>>>>>>> On Thu, Jan 5, 2012 at 9:06 PM, Ikai Lan (Google) <
>>>>>>>> [email protected]> wrote:
>>>>>>>>
>>>>>>>>> Mos, what browser is this?
>>>>>>>>>
>>>>>>>>> I've seen some talk of this but it's passing and we can't seem to
>>>>>>>>> catch it in action. I need more data so I can hunt this down - URLs 
>>>>>>>>> when
>>>>>>>>> this is failing. The reports I've seen are that this happens 
>>>>>>>>> specifically
>>>>>>>>> to Chrome users.
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Ikai Lan
>>>>>>>>> Developer Programs Engineer, Google App Engine
>>>>>>>>> plus.ikailan.com | twitter.com/ikai
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Thu, Jan 5, 2012 at 8:37 AM, Mos <[email protected]>wrote:
>>>>>>>>>
>>>>>>>>>> Just found the issue
>>>>>>>>>> http://code.google.com/p/googleappengine/issues/detail?id=6655
>>>>>>>>>>
>>>>>>>>>> It's three days old and describes a fatal error that seems to hit
>>>>>>>>>> more and more people.
>>>>>>>>>>
>>>>>>>>>> No response from Google?
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Thu, Jan 5, 2012 at 5:30 PM, Mos <[email protected]>wrote:
>>>>>>>>>>
>>>>>>>>>>> My site is down currently, because GAE response CSS files
>>>>>>>>>>> without mime-type:
>>>>>>>>>>>
>>>>>>>>>>> REQUEST:
>>>>>>>>>>>
>>>>>>>>>>> GET /static/css/master.css HTTP/1.1
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> ...
>>>>>>>>>>> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; 
>>>>>>>>>>> rv:1.9.2.25) Gecko/20111212 Firefox/3.6.25
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> Accept: text/css,*/*;q=0.1
>>>>>>>>>>> ......
>>>>>>>>>>>
>>>>>>>>>>> WRONG RESPONSE:
>>>>>>>>>>>
>>>>>>>>>>> HTTP/1.1 200 OK
>>>>>>>>>>> Etag: "sR7Bag"
>>>>>>>>>>> Date: Thu, 05 Jan 2012 16:22:34 GMT
>>>>>>>>>>> Expires: Thu, 05 Jan 2012 16:32:34 GMT
>>>>>>>>>>> Cache-Control: public, max-age=600
>>>>>>>>>>> Content-Type: null
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> Server: Google Frontend
>>>>>>>>>>> Content-Length: 37206
>>>>>>>>>>>
>>>>>>>>>>> Does anybody else have the problem?
>>>>>>>>>>>
>>>>>>>>>>
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