When I try to remove widgets in Safari on both Mac OSX and Windows I get the following error:
The parameters of your request are invalid.
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Additional information about this error:
Illegal value received for parameter «wi_ID»!
I am not sure if this is relevant or not but I thought I would take a little look in the database to see if the wi_ID that the admin console is looking for is actually in the database and it is all there as far as I can see. The URL for the delete action looks OK (49 is in the widgets table):
Interestingly though if I click on that link to delete the widget I still get the error displayed but the url in the browser is: