not sure if known bug, it would surprise me if not, but maybe our system is a bit unusual...
When opening a local file using the internal editor I get the error "Invalid Access to Memory.
This also occurs when opening a file using an alternative editor (Notepad++), the same error pops up.
I can however click OK and continue editing the file.
This is on Windows server 2008 running through a Citrix screen, but also repro'd at a Windows 7 (Enterprise) machine. Both x64 with plenty of RAM (8GB/16GB).
Attached is screenshot of error: