Tried, doesn't help.
iPhone 4 32Gb, iOS 5.1 not jailbroken
Happens to every pdf file: for the files that I had already in the program and viewed them yesterday, and for the newly loaded files.
What happens is - I see the blinking of the screen (feels like something is refreshing every second), then when it stops I either don't see a whole page or don't see 80% of the page (in continuous mode) / 80% on top of the page (single page mode). The files opened FROM adobe pdf in other applications are shown well.
One of the files is big - Nikon D80 Manual, the others are just several pages files.
I can share screenshots what it looks like.