Tried: still hangs.
I’ve been looking at pmotion.exe with Process Explorer and Process Monitor. I can see that the process has threads hooking to the Wacom Intuos and (strangely) also to OmniPage Pro (OCR software).
These are some lines extracted from Process Monitor log file (two different sequences extracted):
"15:29:02,8214945","pmotion.exe","9688","Load Image","C:\Program Files (x86)\Common Files\Microsoft Shared\Ink\tiptsf.dll","SUCCESS","Image Base: 0x6aaa0000, Image Size: 0x80000"
"15:29:02,8231919","pmotion.exe","9688","Load Image","C:\Program Files (x86)\ScanSoft\OmniPagePro12.0\ophook12.dll","SUCCESS","Image Base: 0x1320000, Image Size: 0x28000"
"15:29:02,8237411","pmotion.exe","9688","Load Image","C:\Program Files (x86)\ScanSoft\OmniPagePro12.0\ophook12.dll","SUCCESS","Image Base: 0x1320000, Image Size: 0x28000"
"15:29:02,8657700","pmotion.exe","9688","Load Image","C:\Windows\SysWOW64\Wacom_Tablet.dll","SUCCESS","Image Base: 0x60730000, Image Size: 0x1bb000"
"15:29:02,8671092","pmotion.exe","9688","Thread Create","","SUCCESS","Thread ID: 11768"
Since also Photoshop hangs, I think they have in common some problems with device drivers for scanners, tablets, or some other TWAIN tools. This is the only reasonable link I can see for PM process loading an image from Omni Page.
I’ve reinstalled and updated all my Wacom drivers (Intuos 5 and Inkling) and softwares. Also the Display Color Manager is updated.