Try editing an existing image, without nominating a file for upload. For example, just try editing the caption. If you don't specify an image for upload it appears to bomb attempting to generate a thumb of the non-existent file.

CFERROR:
output == null!
 
The error occurred in C:\farcry\p300\farcry_core\packages\farcry\imageUtilities.cfc: line 22
Called from C:\farcry\p300\farcry_core\packages\farcry\imageUtilities.cfc: line 74
Called from C:\farcry\p300\farcry_core\packages\types\_dmImage\edit.cfm: line 136
Called from C:\farcry\p300\farcry_core\packages\types\_dmImage\edit.cfm: line 131
Called from C:\farcry\p300\farcry_core\packages\types\_dmImage\edit.cfm: line 39
Called from C:\farcry\p300\farcry_core\packages\types\_dmImage\edit.cfm: line 1
Called from C:\farcry\p300\farcry_core\packages\types\dmImage.cfc: line 50
Called from : line 1
Called from C:\farcry\p300\farcry_core\admin\conjuror\invocation.cfm: line 111

20 : <cfset stLocal.graphics.drawRenderedImage(stLocal.bufferedImage, stLocal.jTransform)>
21 : <cfset stLocal.outFile = createObject("java","java.io.File").init(arguments.destinationFile)>
22 : <cfset createObject("java","javax.imageio.ImageIO").write(stLocal.bi,"jpg",stLocal.outFile)>
23 :
24 : <cfreturn stLocal.stReturn>

Browser Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7

Stack Trace
at cfimageUtilities2ecfc1717355472$funcFRESIZE.runFunction(C:\farcry\p300\farcry_core\packages\farcry\imageUtilities.cfc:22) at cfimageUtilities2ecfc1717355472$funcFCREATEPRESETS.runFunction(C:\farcry\p300\farcry_core\packages\farcry\imageUtilities.cfc:74) at cfedit2ecfm331816717._factor3(C:\farcry\p300\farcry_core\packages\types\_dmImage\edit.cfm:136) at cfedit2ecfm331816717._factor7(C:\farcry\p300\farcry_core\packages\types\_dmImage\edit.cfm:131) at cfedit2ecfm331816717._factor13(C:\farcry\p300\farcry_core\packages\types\_dmImage\edit.cfm:39) at cfedit2ecfm331816717.runPage(C:\farcry\p300\farcry_core\packages\types\_dmImage\edit.cfm:1) at cfdmImage2ecfc1432418902$funcEDIT.runFunction(C:\farcry\p300\farcry_core\packages\types\dmImage.cfc:50) at Statement8938.evaluate(:1) at cfinvocation2ecfm2145344220.runPage(C:\farcry\p300\farcry_core\admin\conjuror\invocation.cfm:111)