We were running a weblog on pMachine Free without any problems, then, after updating to Pro we encountered a strange problem, just can’t figure out what it can be:

If you type in our URL in your adressbar and visit our site, everything seems to be all right, but if you visit our site via an external link, old posts surface. pMachine shows the site as it was two weeks (or sometimes even more) ago. After a simple F5-refresh the site returns to it’s current state! Problem is that most people don’t do a simple refresh and just think we haven’t been updating for a long time…. does anybody now what the problem might be?

This sounds like a browser cache issue.  I’m pretty positive this has nothing to do with pMachine itself since pM doesn’t do any sort of caching.

@Chris:
thanks for the quick response:
Initialy I thought the same thing.. but as most of our visitors seem to encounter the same problem and ONLY on our site I can’t seem to convince myself that there isn’t something else going on.
Furthermore even visitors that never before visited our site seem to have this problem, so it can hardly be browser-cache related.
Could it maybe be some kind of server side caching (proxy or whatever)...?? I don’t know a lot about this kinda thing…

It might be server-side caching (or perhaps intermediate router caching).

As I said, pMachine Pro doesn’t do any caching of its own, so whenever you visit the page pM dynamically generates it every time.