I just got a Sony VAIO VPCEB32FM and have the same issue: left click is completely unresponsive. When I check the driver options, it tells me that I have the most up to date driver. If I find a solution I will report it here!
Since acquiring my Sony Model VCPEB13FX Laptop I have had a series of issues with the touchpad. These including erradic cursor movements and mouse buttons (particularly the left) not working. Sony has advised me to reinstall the driver which I have on multiple occaisions and that may or may not give some temporary relief. What happens now is that I want to left click and I cannot. I can move the cursor. The item to be clicked on appears to be responsive but I cannpt click on it. Sometimes right clicking and then left clicking will work. Sony has replaced the motherboard once and this did not correct the issue. Anyone else had similar experiences? BTW have scanned for malware, viruses etc and nothing is found.