I agree with Lonnie, jerky meters are almost always on the users end, not WGT.
I am nowhere near as computer savvy as Fatdan (from reading his posts, I figure he has forgotten more than I will ever know), but something is up.
The last WGT update was 3/14. At the same time Microsoft made a security update for Adobe Flash Player (3/13). I am not saying this is the problem, I am just pointing circumstantial evidence. The link below shows a bulletin published on 3/17, but on my system the update installed on 3/13.
Link to Microsoft update info: https://technet.microsoft.com/library/security/MS17-005
So far so good for me on my meter, but I am keeping my fingers crossed.
- Mark