Hi John Chatt,
In general there should be no problems with temp files with the latest release. I've tried uploading some files without saving them to the target folder (hence leaving them in the temp folder) and the latter were successfully deleted after the amount of time specified in the TemporayFileExpiration property (4 hours by default). In the light of this, we will need some information regarding your scenario:
1) Did you use IIS or Cassini for your tests?
2) If IIS, have you restarted the application pool?
3) Have you restarted your computer?
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