[dokuwiki] Some computers unable to upload large images?

 I've just been trying to track down a weirdness with our wiki. Here's
what happens:

 User A, on PC A, can upload images just fine to anywhere.

 User A, on PC B, can upload images less than (guessing) 1mb in size. 
 
 User A, on PC B, _can't_ upload larger images. Trying to upload big
images, the 'upload' button flickers, the browser window for the media
manager says "done", but the image isn't there.  (not in the media
browser, not in the media/ folder, nowhere). If they resize the image
down on the local PC, it can upload fine.

 I did some tests, and it's not permissions-related, it's purely related
to the size of the image -- but this only happens on some PCs. 

 Does anyone have any ideas what might be causing this? It seems to only
happen with dokuwiki -- uploading the same (large) image from that PC to
a different server (with HTTP POST) it gets through fine, so I don't
think it's an IE setting or something.

 -- dan
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