Error Message Accessing Forum Post

Hope someone has not posted this before. 

A few times this week, I've accessed the main forms page ( ) and then clicked on a link in one of the recent activities columns. I then get a white page with the error message indicator in the lower left corner.

Clicking on the indicator brings up this:

(I should have also copied the error details but forgot to do so.)

My browser is IE8:

Any idea what is going on?

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