I was typing a document in Word 2010, which I am well familiar with, when suddenly, without my apparently having touched anything by mistake or leaned on the keyboard, the document went into fast-forward-delete. I haven't lost much but the delete has now reached the end of the document and I can no longer make inputs although I can move the cursor. A small blue horizontal rectangle has appeared under the position of the space next to the last letter in my document. Can someone help please? I think this may be finger-trouble (Bullguard anti-virus is installed).
Thank you.
Martin