[gdal-dev] GDAL WorldWind Mini-Drive problem under Windows 2008 R2 on VM

[EVANS, JAMES R GS-13 USAF ACC 84 RADES/SCZE]

Hi,
I was running Mapserver under Windows 7, using the gdal worldwind minidriver to serve up imagery from various tile sets.  I'm trying to migrate to Server 2008 R2.  I don't seem to be able to get the mini driver to work and it looks like a permissions issue.  Any suggestions on how to troubleshoot this would be greatly appreciated.  Here is a log entry from Mapserver showing the failure.  I have given "Everyone" and "DefaultAppPool" Full Control over the C:\Mapdata directory.  
Thanks,
James

Here's what happens in the Mapserver Log:
[Mon May 11 10:36:44 2015].62000 msDrawRasterLayerLow(WAC_2014): entering.
[Mon May 11 10:36:44 2015].62000 msDrawRasterLayerLow(WAC_2014): Filename is: c:\MapData\WAC_2014.xml [Mon May 11 10:36:44 2015].62000 msDrawRasterLayerLow(WAC_2014): Path is: c:\MapData\WAC_2014.xml [Mon May 11 10:36:44 2015].62000 msResampleGDALToMap in effect: cellsize = 0.002197 [Mon May 11 10:36:44 2015].62000 msDrawGDAL(WAC_2014): using RAW_WINDOW=114687 29695 1026 1026, dst=0,0,1026,1026 [Mon May 11 10:36:44 2015].62000 msDrawRasterLayerGDAL(): red,green,blue,alpha bands = 1,2,3,0 [Mon May 11 10:36:44 2015].78000 drawGDAL(): Unable to access file. GDALDatasetRasterIO() failed: GetBlockRef failed at X block offset 223, Y block offset 57 [Mon May 11 10:36:44 2015].78000 msDrawMap(): Image handling error. Failed to draw layer named 'WAC_2014'.
[Mon May 11 10:36:44 2015].78000 freeLayer(): freeing layer at 000000000043D5C0.