It sounds as though the unexpected shutdown has corrupted the Imperial catalogye if the metric one works OK. Reinstalling should fix it.
It is advisable to keep a regular backup of your catalogue elsewhere on your computer, especially if you have added new elements or customised some. If a corruption does occur with an unexpected shutdown, then you can just copy your backup back to the TFP folder.
Make sure you take a copy of any projects you have done before you reinstall, just in case.
You could of course just stay with the metric catalogue - it is SO much easier than imperial - after you learn to think in metric of course!
By the way, from what I can see of your model it s looking good! Hopefully you will post some images in the Gallery when you are finished.
Allan