IllegalStateException error with Quartus/Nios 6.0?

I recently got my shiny new Stratix 2S60 dev kit, which came with Quartus and Nios 6.0. I tried building one of the example designs, did the hello world program, everything was fine.

Next I tried porting one of my 5.0 designs. I basically rebuilt the thing from scratch inside Quartus 6.0, didn't import anything except the VHDL files, and I added Mike DeSimone's FIFO interface component to the components directory.

Now, when I try to build hello world against this design, I get this error:

(SEVERE) generate: java.lang.IllegalStateException: java.lang.IllegalStateException: java.lang.NumberFormatException: For input string: "6.01"

It's talking about a "6.01" value in the std_2S60ES.ptf file. If I change it to just a "6" it goes away and complains about a different value with a decimal in it.

How do I make this go away permanently?

EDIT:

Uhhh...I closed the IDE and reopened it and the problem went away. Even though I'd tried that already. So I guess if this happens to you, try that several times!

*sigh*