[SOLVED] Changes delayed in appearing?

I'm noticing that I will make a change and it won't show up ...immediately? ...at all?

The change might be to the width of a <div> in the Atahualpa Options CSS Inserts. I remember to click Save Changes and then switch to another browser tab which has the site loaded and re-load (refresh) the page. The <div> does not show the change.

Sometimes if I re-load the page again, the change might show. Sometimes, maybe I'll load a different page and then come back to the one with that <div>.

Logging out of the Dashboard completely might help.

Is it a problem to have the Dashboard open in two Firefox tabs at the same time? -- maybe with Pages open in one and Atahualpa options open in the other? I've always assumed that once you clicked on "Save Changes" or "Update Page" or whatever, that any changes you might have made would be "active" and viewable by anyone in their browser of choice.

What's going on?