I flashed CyanogenMod 10.0 stable on my Vibrant last night and it's working really well. The only thing is that if I reboot into recovery from the long-press Power menu, the device reboots normally instead of going into recovery. If I use the Power+Volume Keys combo to get into recovery it works, but choosing the "reboot system now" option from there does not — it goes into an "unknown upload mode" like when I reboot with Power+Volume Up.

Holding the Power button to reboot works, of course.
Is there any way to fix this? I'm using the ClockworkMOD Recovery that was installed automatically when I flashed CM, v6.0.1.5. ROM Manager tells me that there is no recovery available for my device so this is obviously something custom for the CM Vibrant build.
reboot system nowdisappeared, maybe there's no known way/method of doing it on your handset or CM omitted it? Have you investigated TWRP, a different version of CWM that is touch-screen enabled, it may have that option in place? Downgrade to a stable version (5.1.x)? – t0mm13b Jan 21 at 17:47