I just posted this into the bugs, but it seems like it might be related to other errors we're experiencing on 6.0.3 regarding the briefcase and file attachments.

I received a license file from Citrix for XenServer and I am not able to open/preview/download the attached file. All attempts result in the error below. I'm also receiving a number of intermittent complaints about items in briefcase being unavailable at various times while fine at other times...

HTTP ERROR 500

Problem accessing /service/home/~/license.xslic. Reason:

system failure: native formatter failure

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