Hi, Can optseq2 converge on a solution when an event occurs only once?

I'm having difficulty fitting a single nuisance event into a design. In each experimental block, I have 9 trials of interest, and one rare event who's HRF is unimportant to me, but which needs to be separate from the NULL condition. For the trials of interest, I'd like to keep the ITI at 2-10 seconds, but, if need be, I'd be happy to have an ITI of 60 seconds for the nuisance event if would allow this to work. Any ideas would be greatly appreciate-- the following code fails to settle on a solution:

../../optseq2 --ntp 100 --tr 2 --cost eff --tprescan 0 --psdwin 0 18 1 --ev EV1 6 3 --ev EV2 7 3 --ev EV3 8 3 --ev Nuis 11 1 --tnullmin 0 --tnullmax 12 --nsearch 1000 --focb 1000 --nkeep 100 --o output --log log --polyfit 2

P.S. The mail list's search function doesn't work for me, so please forgive me if this has been covered in a previous thread!

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