TB 3.0.4 Portable and Mailtweak Option Defer bug

Yesterday I installed Mailtweak http://mailtweak.mozdev.org/index.html on my portable Thunderbird 3.0.4.
I need to use the Defer ( http://mailtweak.mozdev.org/mailtweak-defer.html ) option of this Addon, since sl8tr and other Addons don't work for TB3.

Everything works fine, except for this function. It saves the timed messages in a folder "Deferred" in the outbox, but they never send.
This might be a problem only with the portable version, because I have no problems with the local version on my other pc.

I already signed a bug report in mailtweaks bug list, but since I think that's an issue of the portable version, I wanted to tell you guys, too.

so far.

STeF