I had some code that looked like this to clear out the temp folder:
NSFileManager *fm = [NSFileManager defaultManager];
[fm removeItemAtPath:NSTemporaryDirectory() error:NULL];
[fm createDirectoryAtPath:NSTemporaryDirectory() withIntermediateDirectories:YES attributes:attr error:NULL];
This used to work. The second call to NSTemporaryDirectory() now returns nil or /var/tmp or something equally different from my app’s temporary directory.
To fix, cache the value of NSTemporaryDirectory