hornbyp wrote:
Since my 2860n appears to use exactly the same mechanism for refreshing the 'dashboard', I thought I'd have a little play.

The way it works - which is probably what you'd expect - is that the Browser makes periodic requests to the Vigor, for the raw data to be inserted into the Web Page (i.e. it doesn't request an entire page/frame, just the 'numbers'). If that data came back corrupt - somehow - you could imagine the javascript in the Browser deciding to 'reset' and re-paint the whole page.

It's hard to imagine what would 'corrupt' the 2927's o/p ... unless you have one the more paranoid 'Security/Antivirus tools' in use.
What does it do, if you access the Vigor via HTTPS:// ? (which ought to stop any intermediary messing with the o/p)

This could well just be a straight-forward bug

(It's quite amusing watching the Vigor 2860 in action ... it periodically invokes "http://myrouter/dashbctl.cgi?someparams" - which returns some sensible data in JSON format. It also accesses "http://myrouter/doc/dashbGet.htm", which returns a huge splurge of plain-text. The header says it's "Text/HTML", but it's not; it's devoid of any markup. This data appears to be discarded - though it's hard to tell, if any part of it gets used. It's certainly malformed!)