Quote - For example, I saved a pic selecting PhotoShop PSD format and the result is Render1.png :blink: , a file which is impossible to open with any viewer... until I change manually the extension from png to psd and then it works OK
 

 
Haven't had that problem either, P7 pretty much saves to the extension I select. (Though I've never really tried to save to PSD directly out of Poser) Have you tried the other extensions other than PSD to see if they revert back to PNG as well?

Quote - Also, when given the choice of percentage, as with a jpg, 100% is the best quality.
P7 Defaults to 75%

I have also found that P7's jpeg compression to be a bit funky. ANY setting below 100% (even like 98%) gives me really nasty artifacts. This didn't seem to be the case in previous versions of Poser as anything in the vicinity of 95% or so were pretty clean before.

Hey! His nose is dry! ... Someone should lick it,  just in case. - Diego