SUID Lib Fix "Main Script Execution Failed" Message

[McPepsie]

PLEASE HELP ME!!!!!! I need to install the SUID lib fix in order to use the MMiThemer.app (which may i add is absolutely amazing!!!!!) The app was working but then now it loads, the screen goes white and it returns me to the iphone home???!!!! But i do remember when i was installing the app that if i did get these symptoms to install SUID fix and it would sort it, the issue is i get the message that so many of us are getting, "main script execution failed". I have looked and looked and looked for an answer to this problem through forum, after forum and the only solution i have found risks me bricking my iphone (NOT AN OPTION) as it was quite a complex operation i decided to pick the brains of you guys. I really hope someone knows a fix for this, as i want to use the coolest app available at the mo,
Thanks for all your help

[sudburyballer]

There are many with this same issue, also searching the wheels off google to find an answer.