For those of you using SweetFX and using Nvidia GPUs

I upgraded my Nvidia drivers to 344 and it somehow broke the hook in d3d9.dll for SweetFX and any variant. It exhibited very strange behavior. A simple driver rollback didn't correct the issue, I had to perform a system restore from a snapshot before the driver upgrade. If you like your eye-candy and you're using nvidia, stick with the 340 drivers for now!

If you receive the error below, you should restore your system to a point before you upgraded your drivers; and always create a system restore point before a graphics driver update!

Code:

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The procedure entry point Direct3DCreate9Ex could not be located in the dynamic link library d3d9.dll.

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Problem is caused by the new version of Geforce Experience.
don't install that and 343/344 works fine with sweetfx.

Driver rollbacks are not supported by nvidia fyi, its mentioned in the release notes, always use the uninstaller in programs and features.