I choose the Zen theme for one of my spaces and I get the following error:
Error occurred during template rendering: Invocation of method 'cssBundle' in class com.zenfoundation.theme.ZenTheme threw exception com.atlassian.core.exception.InfrastructureException: Error occurred rendering template content at theme/html/macros.html[line 242, column 30]. Contact your administrator for assistance.
The problem appears to be within the Breeze brand plugin. In order to fix the space, disable the Zen plugin. This will allow you to access the space. Switch the the theme to some other theme (I was left with documentation as the only unused one). Confirm that then switch back to global. This clears the Zen theme.
You can then re-enable the Zen plugin. At this point, I switched to Zen Intranet as the default plugin and changed the theme to Zen and it worked fine.
I'm going to first fully upgrade Confluence to get it current then install Zen again. If that doesn't work, I'll try the support team. However, this is one of those if troubleshooting takes too much effort, the tool isn't worth the trouble.
Also, if we can't nail down an actual cause and get it fixed, but rather magically get it working again, I'm going to drop it. There was nothing odd about my installation, and I can't have a situation where if I change the look and feel on a space have it rendered completely inaccessible. Even the risk that it might happen is a bit much.
Well, uninstall Zen, upgrade Confluence to 5.4.2, reinstall Zen seems to fix things. I'll hold my breath for a while while I develop some custom themes on a test site. If it appears stable, I'll stick with it, as it makes brand development relatively straightforward.
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