I'm having the same problem, but I have never used this plugin before. I took the snippet of code Google Voice gave me and would have it running in the First Footer Widget area. I noticed after this weekend that it no longer displayed the "Call Me" logo nor reacted to clicking where the logo used to function.
I can only assume Google has changed something, or my recent update to 3.3.2 maybe changed something in how the website allows, or doesn't, the object type. Here's my code. Would love someone to maybe comment on this. Thanks
<object type="application/x-shockwave-flash" data="https://clients4.google.com/voice/embed/webCallButton" width="230" height="85"><param name="movie" value="https://clients4.google.com/voice/embed/webCallButton" /><param name="wmode" value="transparent" /><param name="FlashVars" value="id=a48dc57a29ad6139042fb9e6e8abb8997fcd2560&style=0" /></object>