I've just upgraded to IDEA 8.0.
I've downloaded and enabled the Mercurial plugin. After restarting the IDE, I get an 'internal error' with the following details:
Bad version number in .class file
com.intellij.diagnostic.PluginException: Bad version number in .class file
(rest of stacktrace omitted)
It looks like this plugin is incompatible with idea 8. But that's not the problem.
The problem is that if now I try to disable the plugin, IDEA won't let me use the Settings panel.
I select it from File->Settings or from the toolbar, but it just won't pop up.
Closing and restarting the IDE won't help.
There is a workaround: go to File->Configure plugins (this dialog does work) and disable Mercurial. After restarting, Settings work again.
My Environment: Intel Mac OS 10.4.11 - Java 1.5