PNG colors in source AI file get inverted after saving to pdf

[SecondGanon]

This issue popped up about 3-4 weeks ago. PNGs (not all of them) in my source AI file get color inverted / messed up (see below).

It only seems to only happen after I export or "save a copy" as a pdf. It doesn't happen immediately, only once I have closed the AI file and reopened it, the PNGs in the reopened file have now been color-borked. 

Also, it doesn't happen to all PNGs, just a few. Any ideas?

[Ton Frederiks · Accepted solution]

This is a known problem, see Anshul Sainis answer here:

https://community.adobe.com/t5/illustrator-discussions/pngs-linked-in-show-up-in-purple-white-with-y...

[SecondGanon]

Thanks for the response and link!

[Ton Frederiks]

Glad to hear that helped.