Can you give a little more detail on what the problems were/are -- do you attempt to download the files from the web and when you double click on them -- nothing happens.
Or is when you click on them within a site, that the computer locks up of sorts and takes a ridiculous amount of time to do anything with the document.
Did you try waiting when you encountered the issues? Just to see whether they complete or not -- and the only issue being time.
That all said -- re-reading your question, I'm not sure that you're actually saying that there is a problem, perhaps just enquiring to see if there any that should prevent you from upgrading.
If that's the case, then I'd say you're pretty well catered for unless you're using something really wild and crazy.
Let me know your thoughts... and more info on this @ 4 x PDF