I've had ArtioSEF runing smoothly on my system up until 2 days ago. I suddenly get several PHP warnings a day in my error log which read as follows:

[Mon Nov 12 02:43:21 2007] [error] PHP Warning: fopen(/home/../public_html/joomla/components/com_sef/cache/cache.php) [<a href='function.fopen'>function.fopen</a>]: failed to open stream: Permission denied in /home/../public_html/joomla/components/com_sef/sef.cache.php on line 144

line 144 starts as follows:

$cachefile = fopen($this->cacheFile, 'wb');
if ($cachefile) {
fwrite($cachefile, $cache);
fclose($cachefile);

Is this perhaps a file permission issue?
Does anyone know what is causing this?

Thanks,
Chris

It has become apparent to me that my file permissions might have been changed through a back-up that I had to restore 2 days ago. This may have something to do with this problem. The file permissions in the com_sef folder are all 0644, as well as in the cache folder. Could anyone running ArtioSEF perhaps compare this with their files? Much appreciated!