pluginManager.loadClass Problems in MAXScript

I am having problems with pluginManager.loadClass. The plugin is a deferred plugin. When Max loads, its in the list of plugins in the plugin manager... but it's got a yellow dot to denote it's deferred.

So I add:

pluginManager.loadClass MyPluginName

Now the plugin is green in the plugin manager. But my script that called it fails.

However... if I then re-run my script, it works.

Also... if I happen to call it manually (it's a file export plugin) it works. And if I then run my script, it works.

In other words, the MAXScript:

pluginManager.loadClass MyPluginName

fails when first called but not later. But I obviously don't want the users of my script to always have to open my tool, do a failed export, then reopen my tool to do the final export.

Any ideas?

I've also asked about this on the Area Forums.