Hi Joe,
Here you got some advices:
1) Try looking over SYUSESS attributes. Sometimes, files brought from external devices such as CD, Tape Backup, Flash drive comes with 'Read Only' attribute on, you need to turn it off. Also, look for more files.
2) Since you said "sometimes clients can not..."
means the problem is not SBT. If SBT got some problems, nobody will be able to run it at all.