Mylyn with Assembla Trac hosting

Today I tried to configure mylyn on Assembla trac hosting. It seems that mylyn works fine with old trac instances, but it has bugs when you try empty trac instance, you get many http 404 not found errors. Perhaps mylyn developers tested it on existing tracs...

First it can not create first ticket, you need to create one ticket with trac web interface, then mylyn works fine.
When mylyn updates trac properties like components, milestones, etc they are empty at the first time.

I tried mylyn with breakout trac and it worked fine.

You can see my screen cast about setting mylyn on Assembla trac hosting experiment.