[Plugin: More Types] White screen of death

I have problems too. I get a Internal server error when I have these plugins installed.At the moment I only have 2 plugins. The more fields and the more types plugin. After some testing I found out that it starts working again after this:

1. Rename the plugins folder
2. Reload the page (now the white screen of death is gone)
3. log in to wp-admin
4. Rename the plugins folder back to plugins
5. Activate the plugins from the wp-admin
6. It works again.

BUT…

ONLY in the browser that you logged in to.
I disabled both More Fields and More Types separatly. theproblem only occurs with the More Types plugin.