Do you have Root Explorer? If so, go to /system/xbin and scroll down to toolkit. Check and see if the permissions are set to rwxr-xr-x. If they're not, tap Mount R/W and long-press on toolkit, select Permissions and check all the boxes under Read, the first box under Write, and all the boxes under Execute. Hit okay, tap Mount R/O and reboot, then type
su
toolkit -up
If the permissions are already set correctly, then I'm out of ideas.