the reason are the group boxes! After 1hour thinkering i got it. I changed the project to Codesys Control Win and deleted all wago things. After download to the Control Win and opening 127.0.0.1:8080/webvisu.htm I got the same effect like you. I placed one groubox at the mainmenue and the white background appears there too! So the PFC ins't the problem!
Send the project to codesys support --> Meine Frage

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White Background during Frame switching

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