beta 15 Fusion comp disappears

Hi!
Today I tried for the first time to get into the Fusion. And after some work done, I switched to the delivery page and back and all my nodes were gone. The weird is that after some switching between tabs it can show my nodes for a second and then again they disappear.
Today I tried for the first time to get into the Fusion. And after some work done, I switched to the delivery page and back and all my nodes were gone. The weird is that after some switching between tabs it can show my nodes for a second and then again they disappear.