One is that they cannot open documents (Windows XP), the other (on Windows Vista) that the update to version 10 fails somewhere near the end saying there's an issue with a version 7 file.
Currently I have no more information.
On Tuesday I'm going to have a look at the first of these. The second I'll arrange to have a look at sometime; may have to un-install and re-install, but I'd rather understand the problem more first if I can.
Anyone know of, or had experience of, similar problems with Adobe Reader?
I know there are alternatives, personally I use FoxIt, so recommending scrapping of Adobe reader is not a helpful response.