Can't login to PN Portal

[#1]

Suddenly (since this morning, 27/08/10, when it was fine) I can't access the the PN portal using Opera 10.61
I can get the homepage(www.plus.net) but when I click the "login" link (https://portal.plus.net/index_portal.html?home=login), nothing happens
Works fine from Firefox
(Haven't tried IE)
Yes, cleared all cookies etc

Haven't changed a thing ...

[#2]

The same thing has just happened to me.
Had no trouble yesterday but this morning I only get a blank window when I try to log in to the portal using Opera 10.61. Can still access these forums using Opera.
Firefox 3.6.8 has no problem with the portal login page.
Edit: A reboot fixed the problem

[#3]

@paulh
There was definitely a gremlin somewhere so I gave the system a good kick and tested it working OK, please let me know if you have any further problems