Hi All,
Had an interesting issue with a Server Install of 7.1.0 Today
FYI this is Install # 8 . . . so not the first and the others have been clean.
Server 2008 R2
Did an in place upgrade 7.0.6 > 7.1.0
No Errors or warnings on installation, service, local client and remote client all came up OK.
Next automatically scheduled jobs all failed with the attached screen print.
Method not found: 'UInt64 ZetaLongPaths.ZlpFileInfo.get_Length()'.
They are all Basic Jobs (File Delete, File Copy).
Confirmed same with a Test > Show Filtered Files on a Delete Files Task.  This reproduced the same error.
As it is a Production Server did not have a lot of time to mess around in the maintenance window . . . 
<Nothing in the server logs>
<Repair Installation - 7.1.0 Did not Correct>
<Full Uninstall Followed by Install - 7.1.0> Was successful>
....sorry if this isn't enough to go on.
                      Edited by user
                       
2014-01-23T22:06:56Z
 | 
Reason: Add Error and Server OS Details  
                            KJDavie attached the following image(s):