Is there a limit to file size in coda?

I have a setup a test coda+krb5 network, and when I put files larger than my cache size in to coda, there are strange things happening.
Also, if I put the cache size up on a my first test machine in order to put a larger file in, it goes fine, but the smaller-cache machine reports no space left on device when trying to read the file..

Am I doing something wrong, or is this by design?  Or have I already read the answer to this and forgotten whilst fiddling late at night?

Nathan Ward
System Administrator
Esphion ltd.