I get same behavior copying from MSIE in a VMWare VM. Reboots do not fix it.
Host machine:
* Dell Latitude E6510 running Windows 7 Enterprise 64 bit
* VMWare Workstation 7.1.3 build-324285
* Hosted VM is Windows server 2003 SP2
* Application in VM is MSIE 8
I select MSIE window in hosted VM
CTRL-Fn-F11 (capture current window)
Switch to Paint.net ( v3.5.8 Final Release build 3.58.4081.24580 ) in Win7 host
Create new file with CTRL-N. The correct size file is created.
Paste with CTRL-V. This gives the message "The clipboard does not contain an image".
Workaround:
Leave new blank file open in Paint.net
Switch back to hosted app & re-copy same image with same keystroke sequence.
Switch back to Paint.net and paste with CTRL-V. This pastes image.
Alternate workaround:
In hosted VM CTRL-Fn-F11
Switch to PAINT in Win7 host
Paste with CTRL-V { NOTE: If I wasn't a paint.net junkie I'd stop here ;-) }
Copy with CTRL-C
Switch to Paint.net
Create new file with CTRL-N then paste with CTRL-V.