I have a ultrawide screen running at 3440 x 1440 and as such I turn up the windows scale and layout to 150%.
I read many forums, installed updated Nvidia drivers, DX9, re-install of RF9.5S, etc and finally I seemed to have found a fix (that works for me anyway).
Hi there - I have a Windows 10 PC and was also having the same experience where every time I attempted to switch airfields it crashed and wanted to send a report to knife edge (D3DXERR_INVALIDDATA File: DXTexture.cpp Line: 531).