[Touch HD General] guney:
I've just noticed something very strange when viewing PDF documents using Touch HD's built-in Adobe Reader LE 2.5: When zoomed into a document and scrolling horizontally by dragging with the stylus, the scrolling just doesn't stop and continues until the view hits the edge of the document! Is anybody else experiencing this?

Here's what I'm seeing in more detail: I zoom into a document (any document, textual or map-based) far enough that the document more than fills the available viewing area both vertically and horizontally. Then I tap and drag the document horizontally. At this point, after stopping dragging and until I lift the tip of the stylus, the document stops scrolling. But, as soon as I lift the tip of the stylus, the document restarts scrolling in the direction I just dragged it and just doesn't stop until it reaches the edge of the document in the scrolling direction. Trying to "catch" the document with the stylus during the scrolling in order to stop it is of no use.

I think I've also noticed that the first couple of attempts at scrolling immediately after opening a new document works fine. The problem sometimes only shows up in subsequent attempts.

This doesn't happen at all when scrolling vertically by dragging. It happens any time the dragging is "mostly" horizontal, but never when I drag "mostly" vertically.

Scrolling around using the scroll bars (by tapping the scroll bar or arrows, or dragging the scroll bar) works just fine.

Could one of you try this out and let me know if you're seeing the same thing?

Some more insights:

The size of the document doesn't seem to make any difference. Small documents or large, it happens every time.

I've played around with "non-linear" dragging. If I drag in an "L-shaped" motion, it appears that the problem only applies when the horizontal portion of the "L" is longer than its vertical portion. Dragging in circles and other jumbled motions produces mixed results.

I came across a map with "bookmarks", where a little "tab" appears near the top of the viewing area in Adobe Reader. When I click the tab, the window splits into two panes, with the top pane showing the bookmark list and the bottom showing the document. When in this mode, the problem disappears. Scrolling by dragging in either direction works perfectly. (And a little faster, oddly.) After I close the top pane, the problem returns. This is the main reason why I think this is an Adobe Reader bug, rather than a side effect of some other software or a setting change that I have on my Touch HD.

I used several other Windows Mobile devices before this one, and on all of them, the software I used for PDF documents was "Adobe Reader for Pocket PC 2.0". (This includes even my AT&T Tilt running WM 6.1.) This "Adobe Reader LE 2.5" is new to me. I wonder if there would be any adverse effects if I tried the 2.0 reader on my Touch HD. I'm worried it might clash with the built-in reader in some bad way. In fact, I'm sure the "Pocket PC 2.0" version of the reader doesn't support VGA (and higher) resolution screens. (I used to use a utility called "Real VGA" on my only other VGA PDA on which I used the Adobe Reader for Pocket PC 2.0 earlier, in order to get it to display documents at the right resolution.) Does anyone here have any experience related to this?

The whole issue evokes an attempt at "inertial scrolling" (not sure if that's what it's mostly called), where, if you "flick" the document with the stylus, the scrolling continues for a little while longer in the same direction after it slows down and stops. If that's what Adobe Reader is trying to do, it's certainly a failed attempt, because there's no sign of a slow down, it never stops, and this happens every time I scroll horizontally by dragging; i.e., even when I did nothing like a "flick".

Anybody have any relevant experiences?