I solved this in my application by using the file wrapper methods 
fileWrapperOfType: error: and readFromFileWrapper: ofType: error: instead, 
which seem to work fine.

-Zorg:-.

On Jul 27, 2011, at 12:42 AM, Zorg wrote:

> I've just realized I forgot to CC my message to the mailing list.
> 
> On Jul 26, 2011, at 7:41 PM, Zorg wrote:
> 
>> Okay, thanks. I filed it as rdar://9845409
>> 
>> -Zorg:-.
>> 
>> On Jul 26, 2011, at 2:00 PM, Kevin Perry wrote:
>> 
>>> There is nothing that you are obviously doing wrong here. Please file a 
>>> Radar with your test app attached.
>>> 
>>> -KP
>>> 
>>> On Jul 24, 2011, at 7:46 PM, Zorg wrote:
>>> 
>>>> I'm having a difficult time figuring out how to implement these features 
>>>> correctly in Lion. I've created a very simple NSDocument based test app: 
>>>> http://pastebin.com/w396Xxi4
>>>> 
>>>> A document in this test app has a window and a text field, the user enters 
>>>> text in the text field, that text is the "state" of the document. The app 
>>>> saves and loads that text.
>>>> 
>>>> I'm saving the data using dataOfType: error: and loading the data using 
>>>> readFromData: ofType: error:. The user interface (the text field in 
>>>> particular) is being updated after being loaded in 
>>>> windowControllerDidLoadNib: unless the data is being reverted, in which 
>>>> instead the user interface is being updated in readFromData: ofType: 
>>>> error: (to test if a document is being reverted, I check if an outlet such 
>>>> as the textField != nil)
>>>> 
>>>> Now, the saving of the document works fine. Browsing and choosing a 
>>>> different saved version of the document also works fine. What doesn't work 
>>>> correctly is reverting to another version. For example, if I create a new 
>>>> document, save the document, make a change (entering something new in the 
>>>> text field and hitting enter), choose revert to last saved version from 
>>>> the window titlebar, and save again, I occasionally get an error message 
>>>> "This document's file has been changed by another application since you 
>>>> opened or saved it." or I get "The location of the document ----- cannot 
>>>> be determined." (I say occasionally because I cannot get it to error the 
>>>> first attempt I do this while a document is still open, but usually always 
>>>> get an error on my second, and further attempts). I can also reproduce 
>>>> this error when trying to save after choosing a different version in the 
>>>> versions browser, however, I think I can only reproduce the error in this 
>>>> case when my document is in an edited state before trying to choose 
>>>> another version (If I save before trying to choose a different version and 
>>>> then save after, I don't get get an error).
>>>> 
>>>> Here's a couple images of the errors:
>>>> http://dl.dropbox.com/u/10108199/error1.png
>>>> http://dl.dropbox.com/u/10108199/error2.png
>>>> 
>>>> Also, is there a better approach to loading a reverted document than what 
>>>> I'm doing (instead of testing if an outlet of a document is nil)? Any help 
>>>> would be appreciated.
>>>> 
>>>> Thanks,
>>>> -Zorg:-._______________________________________________
>>>> 
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>>>> 
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>>> 
>> 
> 

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