I'm running Thingworx 7.2.
I created a Mashup that contains two other mashups.
If I run the Mashup as an Administrator, the containing mashups execute and load appropriate data.
If I run the Mashup as a non-Adminstrator, the containing mashups don't execute and do not load appropriate data. There is no application log information indicating any problems.
Have you tried different browsers?
Could you please check your browser developer tools, see for any suspicious activity/errors during the requests in there?
It does sound like some permission issue though. I'm assuming once you add a user to the administrator group, it shows properly. Is this a problem with any contained mashup or just some particular one?