Baselines + Baseline groups empty?

I was playing around a bit with the ESXi images tab and creating a new Upgrade baseline. Suddenly I noticed the screens went blank...

Somehow when I look at the ESXi images tab you still see it's connected to a baseline

Also when I use powerCLI to retreive the patchbaselines they come back flawlessly, to bad not the groups :S

When opening the VUM log files, I see also that all the baselines are retreived. So somehow I thing the database seems ok.

- Tried to restart VUM. Create a new baseline (this works, according to the log but is not shown)

- Patch repository is filled and works.

- Baselines are still connected to hosts and can be scanned 

- When I try to make a new Baseline group I get the error below. Selecting an image or chosing none both give the result below.

Personally I think there went something wrong with an ESXi image and an upgrade baseline.

Anyone got an idea how to fix this or what to do?

-Update

I notice when I have a look in powerCLI I get the error:

At line:1 char:13

+ get-baseline <<<<

I don't have this on another vCenter, here all the baselines are retrieved fine.