The extensions will play nicely together. The template may break the preview if there is javascript added that has errors in it.
a good test is to create a page from the template and open it in IE7 or 8. Make sure to set IE to display a warning about every script error.
you can also try opening the page in Fire Fox, then opening the error console to see any errors that are reported.
If you can send a copy of the template and any supporting Image files, javascipt files and css, I can reproduce the problem on my end and determine the cause of the issue.