Delete Test Cycles or folders within not working

Hi everybody,

I use Zephyr Squad Data Center and I am currently facing an issue that deleting test cycles or folders within seems to be not working. There is no difference whether the cycle or folder contains test executions or not. Even as Administrator with all permissions all I can see is the following:

The delete job never gets finished. Do you have any idea how to solve that or which setting I might have missed?