What font are you using? If FileMaker can not find the font you have chosen, it will go with standard font on that computer and might therefore behave differently on different machines. Therefore FileMaker Inc says in the guide
that you should stay with web safe fonts, meaning fonts that exist on all computers like Helvetiva, Arial, Verdana for example.
Using radio buttons is not a good thing to do with WebDirect. Have a look at my session from last years session to learn more how to make your solution work in WebDIrect
I'm using Arial. I'm wondering if it's _their_ browser settings maybe?
Yeah, I just tested it on multiple computers here on both Chrome and Explorer, and it's Chrome. The layouts render perfectly on Explorer.
Oddly, Chrome on the Mac renders it just fine. Just Chrome on Windows. Urgh.