Hmm problem!

[Tepic]

Please try and take off with one notch more flaps and try not to raise them before your reach 500 feet above the terrain

I'll give that a go. That doesn't explain the no flaps on landing... I know this is a configuration problem with the aircraft I am using, I've
used default aircfaft, and ones from Eurowings professional without any problems at all.

FSP also tells me it is using a default load configuration for the Piper. Maybe I'll have to get my hands dirty with .air files <shudder>