I was alerted to an error on a CodeIgniter site I am developing, which appeared randomly – no changes had been made to the site for a few days, relating to the Browscap functions
A PHP Error was encountered
Severity: Warning
Message: touch() [function.touch]: Utime failed: Operation not permitted
Filename: third_party/Browscap.php
Line Number: 247
After googling I discovered this solution on EllisLab, which fixes the issue – but still unsure as to what causes it.
You simply need to delete the Browscap folder from your application/cache directory.