I've created a variable for a category but I can't change its details. For example, on the page "Add/Edit <variable name> Options" page, I can add radio button items using the button "Add New Option" (the variable is a radio button list), but if I try to change the variable name or even just its description, when I click on "Submit" I wait 15-20 seconds and get "Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding."
The only solution I've found is to delete the variable and start again.