What can you see on the 2 pages?
I cannot see those two pages at all. When I open it in the Reader I can see for example 10 pages, and when I open it in FoxIt I can see 12 pages.
It happens not just in one file, but in many.
What Reader version? "Acrobat Reader" was used until v6.x, after that it is called Adobe Reader. The latest version is 9.4
Could it be some memory limitation? (Although I do not like Foxit Reader [for reasons explained elsewhere], that product is much lighter than Adobe Reader, and may allow use of more memory. Just a guess.)
We are using Adobe Reader 9.4 version.
How can I check if it is a memory issue. This problem is occuring in a lot of PC's in my organization.
I don't know your OS; if it's Windows, use the Task Manager's Processes and Performance tabs.
It could also be a compatibility issue; were these files created with Acrobat?
Does it also occur if you use Adobe Reader 8.x?