These issues aren’t actually issues with TDK, but are the results of how many cable companies handle webpages.
I’ll try and explain this as best I can. Your cable company may see that a webpage is being viewed by lots of people. To speed things along a bit, it may save a copy of that page on its servers (this is called a cache), and when people try to view that webage, they get the version that is held by the cable company, not one from the website itself.
Now imagine this: you’ve been logged in at TDK. A day later you revisit the site, but instead of getting your logged-in page, you get the page held by the cable company, which might be a logged-out version of the page. Alternatively, you might see a logged-in page from another user – it all depends on which page has been saved by the cable company in its cache, and this is why we see these problems. There’s very little you can do apart from being patient, although you could try forcing a refresh:
Windows:
ctrl + F5
Mac:
apple+r
But even that is no guarantee of success. You’ll probably find that these problems don’t exist when you use another Internet Service Providor, because they handle this kind of thing differently.
And just to show that this isn’t just us, this is from the FAQ page on Metafilter, which is probably the biggest community weblog on the net: http://faq.metafilter.com/#98
I hope all this makes at least some sense!