Here are a couple things to check.
- ‘Filter out services departing in the next x min’ has not been set to a large value filtering out most services at a busy station (default is 0min).
- ‘Force on ‘no services screen’ permanently’ is not enabled. This will just force the no service screen to appear.
- There is at least one platform filter selected (and it has services departing)
- ‘Include services with unknown platform’ is enabled.
- ‘Show passenger services’ is enabled.