SOLUTION - for now

I'm absolutely not a fan of this move at all. I did find you can prevent it from happening on future launches though if you go to the image file and make it Read Only (Windows). Not sure how to do this on Mac. Lock the image? But it prevents it from being used and will restore the original splash (for now). I could not solve it by deleting the image or changing the image w the same file name, because it re-downloads it at every launch, but read only seems to be the band-aid workaround for now. Every time you update though you will need to do this again.

On Windows the image is located at C:-Users-___yer yooozer name here___-AppData-Local-Temp-Poser-12- (using dashes because slashes get hidden on forum posts) It will have some crazy file name like "GTdiykRsWM6csaLYx1x68ILPDDXvYMJNZZZNVFpT.jpg" Right click it, go to Properties, then click 'Read Only' to enabled it. Apply, and hit OK. Future launches after doing so should load up the old splash.

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My most recent Poser animation:
Previs Dummies 2