Step to reproduce :
1. Login Liferay using IE8
2. Go to Control Panel -> Web Content
3. Add a web content and save as draft
4. Click "Add Translation" and select a language
5. Pop up "Web Content Translation" and click "Source" to change to source edit mode
Problem : Cannot edit the web content on source edit mode using IE8. Using IE9, this problem is not reproduced.
The issue could be reproduced on latest 6.1.x.
The issue has been resolved in 6.2 EE product.