Daniel,
There was a serious bug in DMX 03.02.00 whereby the recorded file length was set one byte less than the actual length. As a result, when downloaded, the documents arrived with a truncated last byte. Please upgrade to the latest patch (as of this writing 03.02.01) where this is solved. Note that you have to upload the document again or delve into SQL (table DMX_Entries) to set the filesize correctly.
Peter