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Someone posted that they had seen this on their 35s.
Following the procedure in the manual to reset the calculator (in an appendix I think) seemed to fix the problem.
Give it a try. Note that you will lose any programs and data...
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Joined: Jan 2007
I can't replicate the error on mine.
Others have mentioned vector problems.
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Joined: May 2006
I had the same problem once. The 35s didn't accept 2- or 3-dimensional vectors. It did accept 1-dimensional vectors however. The problem went away without resetting the machine. I don't recall doing anything harder than clearing the stack and entering/exiting program mode.
Surely unrelated, but the next day I saw a "LBL ;" at the top of the program catalog. I deleted a line "0001 RTN "(three zeros) I was not aware of, and the label went away. I tried re-entering the line, but the label didn't reappear.
Mysteries to be unveiled...
R.