Signal Tap Error

I'm having problems running signal tap on a board I'm debugging. There are 7 devices on the JTAG chain. After powering up, I launch signal tap and set up the Hardware for USB-Blaster (USB-0). After selecting 'Scan Chain', the tool is able to scan all 7 devices with the correct device IDs. The altera device (Stratix II EP2S60F1020) is 3rd device in the list. I select the device from pulldown list, then browsed to the .sof file and pressed program button. I then see the following error:

The instruction register length of EP2S60F1020 device at position 3 in the JTAG chain is unknown.

The length should be 10 bits for this part, but I don't know how to specify this or make this error go away so I can program the part. I tried to specify the device in Quartus Programmer (along with the non-altera devices), including the IR length, but when I try to program the .sof file into Altera part, it gives popup error that it needs to be the Stratix II EP2S60F1020 part (in its predefined list) that the tool then complains it doesn't know the IR length of.

Runnning JTAG Chain debugger indicates the JTAG hardware chain connection is good & all 7 parts with correct device IDs are shown.

Anyone know of a solution?

Thanks, GMM