Custom Monitor Types disappear

I used the new feature of Custom Monitor Types in build 8400, which worked great the first couple of minutes, now they have however disappeared from the Monitors tab. If I klick the arrow on the Monitors tab, my script type is visible and it says I have 2 monitors of my custom type, which is true. When I click it, it says there are none. I can't find my monitors in the bulk view or any other monitor view either.

The only place where they still are accessible and visible are under the monitor group under which I put them and under the reports tabs (custom types). The scripts are running and executing correctly, the only issue is that they are 'invisible' in the monitor tabs. Seems to be a bug!

Otherwise the new Custom Monitor Type feature saves me a lot of time!
Christian Gerdes