This happened a couple days ago, and I couldn't get it to reproduce.
After several quotes while using Ramul (to maximize my return for cost), I switched to Confirm and pressed Grease the Palms. A white square appeared on the Flash object around the "How can I be of service?" text, and none of the controls responded to clicks. I had to close my browser (IE9, Win7 Professional) and re-log in to recover the game.
I attempted the confirmation of the black market trade using the same Ramulgorithm settings after reloading, and did not experience the problem again.