The Procedure Cache never loads the details. It always states "Loading".
Cache data can't be collected continuously.
This message will be changed in a future version of the product.The new message will be:
"Retrieving Procedure Cache data can be expensive depending on the Procedure Cache size. Press refresh to retrieve Procedure Cache data. No other data will be collected while Procedure Cache data is collected."
Note: Press F5 key to get the current data.