Hi @Linzi Sykes,
Thanks for the update, and I'm glad changing the font helped surface the missing text.
Since the text defaults to the regular style and some elements were originally set to light, you'll likely need to manually reassign the correct weights. One thing you can try is selecting a text box with the light weight and using the Eyedropper tool to pick up its style, then apply it to other affected areas. It might speed things up a bit.
Also, just to be sure, please check if Acumin Pro is activated through Adobe Fonts. If it's a team-uploaded font, try reinstalling it or check with your team to see if there's an updated version available.
Let me know how it goes or if you'd like help reviewing a sample file.
Abhishek
Thanks again, the issue now seems to be resolved due to reinstalling the fonts. There seemed to be an added issue with the pro and variable versions of the font, in the text boxes which contain multiple languages. Thankfully I don't need to manually amend each file!