I have installed ProgDVB 4.92.4 with default configuration to several different machines (both physical and virtual) and all have one issue:
dialog opened by clicking Service -> Scheduler -> Add shows first combo box totally empty (here is screenshot with this combo clicked)

For version 4.92.4 I have tried disabling all other modules and changed plugin API version in Options - none of this helped.
Can this be a bug? Can you provide links to versions between 4.91.8 and 4.92.4?