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dave_mwidave_mwi 

can't view new leads in my sandbox. Error: 'Data Not Available'

I've just created my sandbox and when I try to create a lead, I get this error on the next page after clickig the save button:

Data Not Available The data you were trying to access could not be found. It may be due to another user deleting the data or a system error. If you know the data is not deleted but cannot access it, please look at our support page.

I've not been able to find anything about what this means.

I'm also getting a salesforce application error when I try to look at my user permissions while logged intot he sandbox - I thought the error might be related to this.

Thanks.