Beta Client is freezing computer after champ select

More of a heads-up for other players than a full blown bug report - I've already filed the report. It seems that the beta test has three times now required me to reboot my computer after it leaves the champion select screen. In short, you get a black screen lasting for over 2 minutes (up to seven minutes first time it happened). Luckily for me these were normal games and we won those games. But suffice it to say, I'm not risking ranked until I know that we have client stability. For those keeping track of similar bugs, it's similar to the black screen bug that were reported for the 5.5 and 6.5 patches [slayer-jinx-unamused]