Upload put on hold ("Resting") every few minutes

Trying to upload a 600 MB file, my upload was put on hold at 59%. The vertical upload bar remained in place but the upload status said "Resting (FORCED_BUT_NOT_YET_ENOUGH_AVAILABLE)"
I don't know what this means, what's not available enough? Local disk space? Wuala quota? Physical / virtual memory? In my case, there must have been plenty enough of all of those.

I clicked on the upload-line and pressed "Start Now", which caused the upload to continue, but only for a few minutes, after which it went resting again. I repeated this several times, the upload always moves on for 1%-3% and rests again. (currently at 72%)

The problem occurred using the 32bit Linux version of wuala (Sun Java 6 SE), but a friend of mine had the same issue with the windows version a week ago. In his case, the upload went through continuously after pressing "Start Now" a single time.
 
indifferent I’m puzzled
Inappropriate?
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