Using (Parallels) PS as an external editor for Aperture

Question

I am new to the Mac so perhaps this has already been addressed. If so, I apologize.
I am using Aperture for my photo editing and have been using PhotoShop CS5, through Parallels, as an external editor. Much to my surprise this works reasonably well most of the time although sometimes I run into a very puzzling situation.
Typically I use CS5 to take care of lens distortion since Aperture does not have that functionality built-in. I adjust an image and, if it needs perspective adjustment, I call CS5, through Parallels, convert the object into a Smart Object, Transform the object using the Distort functionality, flatten the image and save it to return to Aperture. Most of the time this works just fine. However sometimes I end up with an image that Aperture tells me it cannot open and, when I try to open it with PS again, it also fails. Sometimes the newly adjusted image just never shows up in Aperture and it is as though it dispappered into the ether.
I have tried Save and I have tried Save As using the same location specified by PS. Save normally works but sometimes fails as described above and Save As always seems to fail. Can anyone tell me what is going on here?
One more note. When the attempt to adjust the photo in CS5 fails I have tried again and again and it always seems to fail for those images. I have no idea why this should be but repeated attempts fail. I have success about 60% of the time and the rest of the time either I get an image that cannot be opened or an image that just disappers. I am using CS5 under Parallels because Adobe will not give me a license for the Mac version unless I upgrade and I would rather not pay the $200 and I don't want to end up in CC.
There are really two issues here. First, why is CS5 occasionally failing and, second, is there a good replacement for CS5 that will work with Aperture to do Perspective Adjustments. I have the trial of PTLens but CS5 is much more flexible in how it allows me to distort an image since not all my image distortions from UWA lenses are symetrical and PTLens only handles symetrical distortion.
Thanks for any help anyone can provide.

Answer 1

Agreeing with 99jon, and adding that in my opinion, the only logical use of the two programs is to use the Lightroom Library Module (not the PSE Organizer) as the tool for organizing your photos, and the Lightroom Develop module as your primary editor, and the PHotoshop Elements Editor as the supplemental editor for the situation where you need more power editing than Lightroom provides.
Why? Because Lightroom is designed  so that it can relatively seemlessly send photos to PSE for extra editing and receive the edited photo back from PSE.
There is no relatively seemless way to have the PSE Organizer send photos to Lightroom and receive the edited photo in return. You will do a lot of extra work to make this work. I am also very skeptical about this statement, I don't think it opens your photos in the Lightroom Develop Module, but I admit I haven't tried it: "I figured out how to configure Elements to call Lightroom to edit a picture directly.  (Edit-> Preferences->Editing)  WIth that setting, I can now use lightroom on my photos."