I can reliably repeat the following behaviour which results in a crash.
Right mouse button on a .JPG (or any image) and select "Convert to PDF"
This results in the Merge-Rearrange window popping up, with the image file listed as the only file to merte. Hitting Run results in a popup which says:
Access violation at addrss 0064F3C5 in module 'Manager.exe'. Read of address 00000010
And one then needs to use Windows task manager to kill the Application. (The running PDFShell tools process is Manager.exe)
Now, I've got ALL the tools options selected (Keep Layers, Group by document etc etc) and Names is set to
[Counter:0|1|0|A] [F]
I'll have a go at removing some of these and see if it makes it not-crash....ah, it's the "add blank page" that's causing the crash