Can't add blocks to stacks

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Whenever I try to add a block to a stack I am constructing, nothing happens. I click on the block to add (content, feature, file, etc.) but no block adds and there seems to be no communication between the browser and the server. I do my developing in Chrome but have tried this in Firefox and IE as well, with the same results.

Has anyone else experienced this problem? Any known solutions and/or suggestions?

Thanks!

edit: In case it's useful, I'm using 5.7.2; Chrome: Version 38.0.2125.111 m; Firefox: v30.0

 
mhawke replied on at Permalink Reply
mhawke
You say you are clicking on a block to add it but in 5.7. You drag the block from the 'Add' panel onto your page.
stereocenter replied on at Permalink Reply 1 Attachment
When you're in page edit mode, you are correct. However, I'm talking about creating stacks within Dashboard > Stacks & Blocks > Stacks. Then I choose to edit my custom stack, and select "Add Block." That gives me a vertical list similar to what we saw in 5.6 when editing pages. I've attached a screen shot to show what I'm talking about.

edit: the content you see in the background I was able to add by creating it on another page and pasting it from the clipboard.
mhawke replied on at Permalink Reply
mhawke
Sorry, I need to read better before answering. Any errors showing up in your JavaScript console? Ctrl+Shift+J