Multi layered 16 bit psd files appear mangled in Aperture

Hello everyone,
I have started using Aperture as my main organisation program but I have some issues with its integration with Photoshop. In paricular when I open my file using 'open in an external editor' in Photoshop it works fine until I do some multilayer editing. The image then appears weirdly mangled usually with only one layer showing and the rest left as black. On occasions I get some weird effects distortions ot parts of other images etc. I think the problem appears when the layer has some transparency but I need to check that further.
I am using 16 bit psd file and I have checked maximize compatibility in Photoshop. I've also tried to update or generate the preview in aperture with no results. Finally, I tested the same thing on a mac at work getting the same problem so it is not specific to my machine. Note that when I open the file back to photoshop everything is fine so this should be just a preview issue.
I would be grateful for any help,
Dionysis

Thank you both for your answers.
In the meantime I researched further and found exactly the issue and a workaround. The issue is only with 16 bit psd files and has to do with alpha channels as you both mentioned. Now, I would disagree that this is acceptable behavior Leonie. In my opinion this is a serious bug but anyways..
A workaround is to place an all white alpha channel exactly after the RGB channels and BEFORE any other alpha channel as suggested here:
https://discussions.apple.com/thread/2708851?start=0&tstart=0
This is working (contrary to what is said in the above post) but be patient with the previews as they take ages to update.
Trying to automate this I've made an action to create the alpha channel and used the script manager to run it when a new document is created. Now this does not work because the document is created in Aperture when pressing 'open in external editor' and the event is skipped. I instead had to associate the action with 'open document' which of course means that I will have an alpha channel created every time I open a document..
I made the action so it names the channel 'bug fix' so I will just have to clean up every now and then.. I may choose to activate the action with a shortcut instead and have to remember every time I create a new document.
Anyways, a bit of an annoying bug and seems to be around for quite a while. Hopefully Apple is going to fix it at some point.
Best
Dionysis

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Image compression in Photsohop CS6 doesn't seem to be effective on a 16 bit PSD when Maximize Compatibility is turned on.
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http://forums.adobe.com/thread/375776
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http://www.scriptsrus.talktalk.net/LSA.htm
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iMac 27"
os 10.7.4
Extensis Suitcase Fusion
Adobe Creative Suite 5.5
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Software Mac OS X Lion 10.7.4 (11E53)
Adobe Photoshop CS5:
Version:          12.1
Last Modified:          24/05/2012 16:38
Kind:          Intel
64-Bit (Intel):          Yes
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Location:          /Applications/Adobe Photoshop CS5.1/Adobe Photoshop CS5.1.app

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Thank you both for your answers.
In the meantime I researched further and found exactly the issue and a workaround. The issue is only with 16 bit psd files and has to do with alpha channels as you both mentioned. Now, I would disagree that this is acceptable behavior Leonie. In my opinion this is a serious bug but anyways..
A workaround is to place an all white alpha channel exactly after the RGB channels and BEFORE any other alpha channel as suggested here:
https://discussions.apple.com/thread/2708851?start=0&tstart=0
This is working (contrary to what is said in the above post) but be patient with the previews as they take ages to update.
Trying to automate this I've made an action to create the alpha channel and used the script manager to run it when a new document is created. Now this does not work because the document is created in Aperture when pressing 'open in external editor' and the event is skipped. I instead had to associate the action with 'open document' which of course means that I will have an alpha channel created every time I open a document..
I made the action so it names the channel 'bug fix' so I will just have to clean up every now and then.. I may choose to activate the action with a shortcut instead and have to remember every time I create a new document.
Anyways, a bit of an annoying bug and seems to be around for quite a while. Hopefully Apple is going to fix it at some point.
Best
Dionysis

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"Layered Photoshop (PSD) files need to be saved in RGB or Grayscale color mode for After Effects to import them as a composition and to separate the layers. CMYK, LAB, Duotone, Monotone, and Tritone color modes are not supported for layered files; After Effects will import a file that uses one of these color modes as a single, flattened image."

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Multi layered 16 bit psd files appear mangled in Aperture

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