Color Profile issues / Colors darken when saving as png/jpg

Hello Adobe Community!
I got a problem with the color settings / profiles in Photoshop and I hope someone can help me.
For the record: I Am working an a PC (Windows 7) with Photoshop CS4.
I work on a digital painting in Photoshop and to keep track of my progression I save frequently as pngs.
I noticed that the colors don't match and are much darker as you can see in the picture below:
I tried the things suggested in many forums, checking and converting my color profiles. For many that seemed to fix it, but not for me.
In the source space you can see the Profile I am using.
Many suggested when saving for web and devices one should untick the "convert to sRGB" checkbox, but for me, that didn't change anything and the colors were still messed up.
I hope someone has a solution for this problem. After trying so many things I'm getting quite desperate!

always CONVERT to sRGB (if not already there) when saving for the web and unmanages apps
there are both pros and cons for tagging/untagging images for the web
the slight darkening and saturation difference i see in in your posted image is expected between managed and unmanaged apps, but you didn't embed a profile so it is my guess what you are seeing there
to duplicate the phenomenon, in Photoshop, open your tagged sRGB image, then
View> Proof Setup: Monitor RGB (be sure to turn it back off)
the shift you see there is the difference between sRGB and your monitor profile (Photoshop is in essence stripping the sRGB profile and sending the RGB numbers straight through to the monitor with no changes)
as you probably know, Photoshop normally transforms (changes) the source colors to the monitor profile...

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