I have a live site running Umbraco 4.5.2 (IIS6) which pulls events through based on multiple dates (for which I have used uComponents Multi-Date Picker). 

For some unknown reason the event pages suddenly stopped pulling the dates through which meant they didnt appear on certain pages (although they still existed in the umbraco.config).  Now recycling the app pool and deleting the umbraco.config fixed the issue.  But is there a reason as to why umbraco may suddenly stop seeing data in the umbraco.config?  From what I understand when the app starts it caches everything into RAM, and only by recycling the app pool does that cache get recreated from scratch - if that is the case then what could possibly cause this?

Thanks,

Mike