Visual Studio 2010: Editor stops responding to keyboard

I've got this very odd bug that appears to be a quirk in Visual Studio 2010: Sometimes, when moving the cursor into double quotes of a CSS style="" attribute the cursor refuses to move. I can't type anything, and the keys that respond are the UP/DOWN cursor keys and the DEL key (but not BACKSPACE).

Typing does nothing, but pushing LEFT/RIGHT on the cursor keys produces the following error:

The operation could not be completed

I've got no idea what's causing this, but I would hazard a guess that Intellisense is getting very confused and bugging out.

At the moment, whenever this happens, I have to write any CSS outsite of the double quotes of the style attribute and then place the cursor where I want the CSS to appear (using the mouse) and press CTRL-V to paste it in. Very annoying :(

There must be a way of fixing this problem...?

Hopefully someone has an answer!

Just encountered the issue in VS 2012, in editing C#.
I noticed that the problem had occurred soon after the trial period of Resharper has ended and i inserted a valid license number. It also happened in only some of the source files.
The solution: Tools->Options->Resharper: Suspend.
Try typing - should work now.
Then: Tools->Options->Resharper: Resume.
Problem gone.

I have encountered this using Visual Studio 2013 and Resharper 8.2.1. None of the solutions provided in this thread worked (even suspending and resuming Resharper)

After contacting JetBrains support, it turned out to be a caching issue.

Deleting all the files from the following directory solved the issue, as Resharper re-creates new caches:

C:\Users\[Username]\AppData\Local\JetBrains\ReSharper\v8.2\SolutionCaches\[Project_reference]