Thanks Mike and Obio,.....with a bit of sleuthing around,...I got the props to appear 'solid' how they should be. Some time ago I had installed Banana Bob's 'prop_us' as my default prop within the Main/Texture folder. As stated in his readme note,...his prop was designed specifically for all FDG2 Donationware
aircraft. (I think I was having a problem with the FDG2 Wildcat's prop being transparent at the time,....his prop solved the problem. I'll have to check more into that). I removed Bob's and fell back to the default one.
Anyway,...by using the stock/default prop bmp. that came with FS9,...all is well.
BTW,...is it better to install the prop bmp. into the aircraft's texture folder or just have it as is in the main/TEXTURE folder?