My polipo doesn't write anything to disk any more!

I've been using polipo for many years, but recently noticed that its
cache was empty (as in literally so: the /var/cache/polipo directory is
clean as a whistle).

    # grep '^[^#]' /etc/polipo/config
    localDocumentRoot=""
    proxyAddress=0.0.0.0
    proxyName=myproxy
    censorReferer=maybe
    relaxTransparency=maybe
    diskCacheRoot=/var/cache/polipo
    maxDiskCacheEntrySize=-1
    diskCacheUnlinkTime=10000000
    diskCacheTruncateTime=10000000
    dnsUseGethostbyname = yes
    #

When I start polipo by hand it just tells me:

    Established listening socket on port 8123.

There's nothing unusual in the log file either.  I tried to change
diskCacheRoot to a dummy location that doesn't exist, and it did give me
an error, so it seems it does pay attention to diskCacheRoot.

I temporarily set disableIndex and disableDirectoryList to false but
proxy:8123/polipo/index shows me an empty page (save for the title),
while proxy:8123/polipo/index does correctly how me the servers
I've contacted.

This is on a Debian testing machine.  dpkg tells me:

   ii  polipo         1.1.1-5      armhf        lightweight, caching web proxy

I suspect that this has been going on for a few months now (probably
ever since I moved my proxy to this new machine, since I'd otherwise
expect the disk cache to still hold some left over).


        Stefan


PS: Here's a sample output, while running as root that time (usually it
runs as user "proxy")

# /usr/bin/polipo daemonise=false logSyslog=false logFile= logLevel=0xff disableIndexing=false disableServersList=false
Established listening socket on port 8123.
tunnel us08.zopim.com:443 allowed
Vary header present (Accept-Encoding).
Vary header present (Accept-Encoding).
Superseding object http://server:8123/polipo/servers (200 688 -1 (none) -> 200 -1 -1 (none))
Superseding object http://server:8123/polipo/index (200 216 -1 (none) -> 200 -1 -1 (none))
Superseding object http://server:8123/polipo/servers (200 1182 -1 (none) -> 200 -1 -1 (none))
Superseding object http://server:8123/polipo/index (200 216 -1 (none) -> 200 -1 -1 (none))
Superseding object http://server:8123/polipo/index (200 216 -1 (none) -> 200 -1 -1 (none))
Vary header present (Accept-Encoding).


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