On my sharepoint site I am unable to add an existing basic webpart to a page where I've added webparts before. I am a site owner. I am using IE 8. I also work remotely using VPN.
The strange thing is IE won't even open up the EDIT MODE. When I use Google Chrome, it is able to open up EDIT MODE, and it was also able to open up the Add Web Part popup, but when you actually select a web part and press ADD...nothing gets added to the main page.
The extra strange thing is from Google Chrome, I am able to delete and modify existing webparts.
I've upgraded to IE 9 and the same issue still happens.