Steam Overlay screenshots come out garbled

[AaronKOG]

Linux f12 and f8 screenshots should now work in the [public_beta] branch and will go out with the next official patch. If you'd like to opt into the [public_beta] do the following:

1. right click SOMA in your library
2. click properties
3. click BETAS tab
4. select "public_beta" from drop-down list
5. click LOCAL FILES tab
6. click VERIFY INTEGRITY OF GAME CACHE...