[Tilecache] TileCache missing a row when using GoogleDisk

[soatley]

I am having a weird problem when seeding my GoogleDisk cache.  TileCache
completes without an issue, names the files properly (Z/X/Y.png) but it
doesn't render one of the rows on my map for certain zoom levels.

I've created a screen shot( http://yfrog.com/0imissingrowp link ) because
there is really no other way to explain it.  In this example, there are 3
rows of images, but there should be 4.  You can see the red arrows that I
placed on the map pointing to where the missing row should render.

The zoom level is 5.  This issue affect zoom levels 5 and below but anything
above seem to render fine.

If I change me Cache type to Disk, it is fine.  GoogleDisk isn't.

Here's my tilecache config:


[cache]
type=GoogleDisk
base=C:\Inetpub\wwwroot\Cache  

[basewdrawing]
type=WMS
url=http://wmsServer
layers=baseMap
extension=png
mime_type=image/png
resolutions=850,425,212.5,106.25,53.125,25,13.28125,6.640625,3.3203125,1.66015625,0.830078125,0.4150390625,0.20751953125,0.103759765625,0.0518798828125
bbox=640541.774843334, 4755587.40501464, 667085.402317306, 4779623.23729788
#metaTile=true
metaSize=7,7
srs=EPSG:26917
#extent_type=loose



I've tried with and without meta tiling and extent_type.  I've tried
shortening the decimal places down to 2 for the bbox and resoultions. 
Neither seem to have any effect.

Shawn
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