I don't know specifically what was changed between 261 and 408 (release notes only cover 9.20.xxxx and doesn't cover each release but it does seem to be getting better. I run Boxee on win XP and since first installing the beta every time I started Boxee up it popped up the "we screwed up and now need you to click ok so we can close" box (which I used to just stuff in the corner so you could only see a pixel of it) this new version takes care of this error for me. Also when I first installed the 408 it wouldn't load my tv shows, so I did a clean uninstall delete everything and reinstall new version, re-added my shares and scanning was done in a few hrs. (that may seem long, but that's about 120 shows and 150 movies so i can easily live with letting it do its initial scan over night.) Getting better Boxee, keep up the fantastic work.
Boxee Beta 10408 W7Pro 64-bit
Intel Core 2 Quad 2.8GHz w/4GB DDR2 RAM
XFX GeForce 9800GTX
1x320GB, 1x750GB 2x1TB, 2x1.5TB and 1x2TB HDD's
URC MX-900 Remote w/USB-UIRT IR Reciever via Event Ghost
Pioneer ELITE VSX-74TXVi AVR
50" Pioneer ELITE Signature Series Monitor (Last of the KURO)