About 1 and 2: I'll look into it.
About 3: have you tried:
- Disabling your virus scanner? (if you have one)
- Exporting to your own Users folder, e.g. C:/Users/[your name here]/? (to avoid permission issues)
- Does loading sprites work as expected? E.g. do loading gifs/spritesheets/individual frames all work correctly?
- Checking the log file? (in the folder where you stored Bitmapflow should be a log file called "bitmapflow.log", can you post its content here?)