Do the buttons only fail to work when you use a web browser to access the database. Or do they also fail if you access the database from Filemaker Pro?
Only in a browser. All works perfectly fine in FMP.
Interesting, when I first created the layouts in FMP at the host (triple8) the buttons worked.
Are these buttons or script triggers on fields? (Script triggers can't be directly tripped by a user action in a web browser)
Have you checked the scripts performed by these buttons for web compatibility? (Open the script in Manage | Scripts and select "Instant Web Publishing" (FileMaker 12) or "web publishing" (older versions). Then look for greyed out script steps in your scripts.)