InDesign Effects not working

[Natalie253284954pab]

Image + Effect shows in Normal Mode
Image + Effect does not show in Preview Mode
Image + Effect does not show in PDF

ATTACHED
Screenshot of
InDesign Effects - Normal Mode.png
Screenshot of InDesign Effects - Preview Mode.png
PDF/X-1a:2001
InDesign Effects not working.pdf

MacBook Pro (13-inch, M1, 2020)
macOS Monterey 12.4
InDesign 17.4

Please HELP!

[Peter Spier · Accepted solution]

First thing I would check is if the frame or layer is set to non-printing...

[Natalie253284954pab]

Hello Peter
THANK YOU! THANK YOU! THANK YOU!
You are a lifesaver!
Problem solved!
Frame was set to Nonprinting in Attributes.
Switched it off and Voilà!