I recall that there are known issues with APC Powershute on Solaris 10 and Solaris 11.
Question is, how did you install it? Did you follow any special instructions (from the web) or did you just execute the program?
I have a note made to myself which says to search the web for APC Kbase FA276327. Perhaps try that first and post back the result especially if that gets you nowhere.
---------- Post updated at 10:08 AM ---------- Previous update was at 10:01 AM ----------
Also, there's Solaris install notes here:
ftp://ftp.apc.com/apc/public/softwar...21/install.htm
although not specific to Solaris 11 might be useful.