This happens when you open a file created under a different regional or code page setting environment.
By resaving, the design file itself will be saved in the current environment, but please note that items related to codepages and fonts, including sample files, will need to be edited or recreated according to the environment.
I tried re-saving and re-deploying the pp design but still getting the same issue. the pp design created .err file on the PlanetPress Watch/Documents instead of .ptk.
Tried Preview or create softproof as PDF, still getting error “Unable to refresh metadata”.
In addition, i noticed this error message upon loading of the pp design. Not sure if this is related.