So you still have the problem hm... Right click desktop -> properties -> settings Give me an SS of it.
Your settings of the screenshot u showed are fine. and yea, go make a screenshot of ur settings when u go to properties when u rightclick on the desktop... I also have a bit of this problem but mines not bad at all.. I'll be lookin for somethin to help ya out and i'll check the PS properties also..I'll post back if I find anythin
How about if you just save at highest possible quality..(.png interlaced) hmm..well maybe the psd is just too bright...I dunno how you would fix that but just check the settings for it like..Image<Mode..other than that i dont know what to tell ya.
People have this problem alot, the fact is, most of the time, its just looking like its lighter. For example; in Photoshop you have a light bg, and in GR a dark, so it might look different.