Thumbnail from PDF is always blank

Tearing my hair out over this.
I generate PDF's from a Fujitsu scanner and need to generate png graphics of each page pair (1-2,3-4,5-6 etc) from multi-page document. If I try to generate the thumbnails directly from the document, <CFPDF action="thumbnail" pages="1-2"...> CF fails to generate anything. If I use <CFPDF action="Merge" pages="1-2"....> to generate the page pairs in PDF and then try to generate the thumbnails from the PDF page pairs, the PNG files are generated, but are blank.
Below is dump of original scanned PDF info:
struct
Application
FUJITSU fi-6130dj
Author
[empty string]
CenterWindowOnScreen
[empty string]
ChangingDocument
Allowed
Commenting
Allowed
ContentExtraction
Allowed
CopyContent
Allowed
Created
D:20100304112505-06'00'
DocumentAssembly
Allowed
Encryption
No Security
FilePath
d:\websites\Duval\EA\Documents\PAR\1.pdf
FillingForm
Allowed
FitToWindow
[empty string]
HideMenubar
[empty string]
HideToolbar
[empty string]
HideWindowUI
[empty string]
Keywords
[empty string]
Language
[empty string]
Modified
D:20100304112551-06'00'
PageLayout
SinglePage
Printing
Allowed
Producer
PDFScanLib v1.2.2 in Adobe Acrobat 7.1
Properties
[empty string]
Secure
Allowed
ShowDocumentsOption
[empty string]
ShowWindowsOption
[empty string]
Signing
Allowed
Subject
[empty string]
Title
[empty string]
TotalPages
40
Trapped
[empty string]
Version
1.6

Usually that means that you have linked to the logical file rather than the correct one. The actual editor is hidden away in the support files folder. The file at the top level of the PSE 12 folder in Applications is just an alias to the welcome screen. You want to choose this one:

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