What i have seen so far:
I always run UO with Razor, never UOA, never UO alone. I get the cascade of error 5's anytime that i have easy uo open, (does not matter if a script is actually running or not) AND my screensaver comes on or if I lock the computer. I have not seen this error with any other program. In fact i can close EUO and go to screen saver or lock and have no issues at all, no matter what other programs are running.
Oh yeah, never saw this error at all until 2 EUO patches ago.
JaF