I feel that 150MB as the default value for:
'Do not resolve videos under this size (MB)'
is far to high. I have many many files (episodes) which are sub 100mb, and even sub 50mb! At first i had wondered why Boxee was missing loads of my episodes... But then i found this option, turned it down to 40mb and it worked no problem.
My suggestion is to change the default value of this option to 40MB