Hello and welcome both to 'The Machine' and the forum's sc_Arks,

What may be happening, is that, all of the work you've done for the machine that's currently showing 'no work done', is in fact, stuck in the Pending Validation (PV) queue. You can check this by using the Results page and using the filtering options.

Whenever a new machine gets added (be it from a new member, or an existing member adding a different/new machine), that machine gets a copy of all their work sent to someone else's machine as well - so as to 'verify' it (i.e., to ensure that it's returning valid results). Once it's been verified against EACH project (it used to be across all the sciences until earlier on this month), then there's a few projects (FA@H, HFCC, HCC & C4CW) that are allowed to be Zero Redundancy (i.e. only 1 copy sent out and whatever that machine returns, within reasons, is allowed - albeit, for occasional 'reverifying', when the odd Work Unit (WU) gets labeled as 'Inconclusive').

As indicated above, earlier this month, there was a major change made to the system, which resulted in EVERY computer having to be 'reverified' against each project. Prior to this change, it didn't matter which project WU's your computer got checked on, once verified, it was verified across the board. Now, it's against each project - i.e., it may be verified against FA@H, but not HCC. Due to this, the WCG techs have temporarily suspended the 'reliable' class, and so, every computer is having a wingman (i.e. someone else) verify their work. Once enough computers have regained their reliable class for each project, the WCG techs will re-enable this option, which will then allow 'rush' WU's to be created with shorter return deadlines (those which have been created either by someone else missing their deadline or an Inconclusive/Errored WU being returned).

So, in essence, the machine which is showing as having had work completed, will more than likely have had a WU validated (i.e., the wingman has returned his copy as well), whilst the other machine will have to wait until at least 1 WU gets validated to show up in your Device list.

Thank you guys for your help :)