Fatal error: ini_set/set_include_path does not work.

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Hi, I know this issue has been raised before but I'm looking for some advice.  I've had 0.2.2 installed and working perfectly for several weeks.  Suddenly last Friday it started producing the Fatal error: ini_set/set_include_path does not work error.

My hosting co say they made no changes that would change the behaviour of set_include_path.

I've created a simple php page and set_include_path always returns FALSE and if I try to use ini_set("include_path".... an error is logged saying that it's disabled for security reasons.

Thoughts?

Thanks