I find openWind normally works very well so, without any further information, I suspect you are spot on about mismatched CRS. According to the documentation:
openWind is fundamentally based on a meter grid so the projection only
comes into play when converting to and from geographic coordinates.
openWind does not carry out on-the-fly projection so it is important
not to mix GIS data from one mapping datum with data from another.
Check what CRS your layers are in using the layer properties in QGIS and then export one or both layers as required in the same CRS (not WGS84). For the Vector layer it is as simple as right-clicking your layer and choosing
Save As. In the dialog box, set the output CRS. For your raster go Raster->Projections->Warp and you can set the Target SRS in the dialog box there.