Contact map is suddenly shrunken, currently columns 5 to 60.5, rows 2.5 to 59.
Restarting the client seems to have fixed the shrunken contact map.
Definitely haven't seen that before. Has this happened again? Do you remember what you were doing when the map shrunk?
Was asking myself the same question when I first noticed it. Had been manually picking contacts for some time, then just noticed the edges were missing. No fireworks, just normal one minute and truncated the next. Closing and restarting the client seems to have fixed it (closing/stretching the contact map window had no affect), hasn't re-appeared and is about 500 points on down the line since it happened. Generic weirdness, best guess.
Have had a similar problem with all contact map puzzles. It is consistently caused by attempting to scroll to "zoom in" on the contact map, after which zooming out causes it to zoom back in once again. Figured it was another bug for Mac users. Also noticed that simply restarting the client and not scrolling on the contact map resolves the issue.
The map can be zoomed, using whatever your computer's zoom control is. I wonder if you somehow zoomed in on it. That makes the edges disappear.
I have a different problem on one client:
I made the contact map so tall that the thin bar at its bottom edge that lets you adjust the map's height is no longer clickable. Now I can't seem to shrink this contact map. Not a big problem, but it would be better if it didn't happen.
To expand on susume's answer to toshiue, the mouse wheel zooms the contact map in or out.
When the contact map window gets "wedged", as jeff101 describes, the resize bar is no longer visible. Restarting the client seems to work in this case. After the restart, the contact map starts at a smaller size.
On some systems, you may be able to flip the display, which is another way to resize the window with restarting the client.
For example, on my Thinkpad laptop, ctrl+alt+left arrow flips the display to the top is on the left of the screen. With this tall thin view, it's easy to resize the contact map. Hitting ctrl+alt+up arrow returns the display to its normal orientation.
(Caution: sometimes display flipping (usually by accident) caused a display driver glitch which caused all Foldit clients to crash. This seems to have been fixed, probably on the Windows side, no recent incidents to report on.)
I just tried the ctrl-alt-left arrow and ctrl-alt-up arrow trick Loci mentioned above. On a Dell Inspiron Windows 7 laptop, this trick let me rotate by 90 degrees an Internet Explorer window as well as a Foldit client window. In the rotated Foldit window, moving my mouse forward made the cursor move to the left, but I got used to this. I was able to shrink the enlarged Contact Map in this Foldit client without restarting the client, as desired.