Strange result on filing very small trade profits

I was helping a relative file her tax return yesterday and something very odd happened.  She is employed and a higher rate tax payer but has a spare time self employed activity as a swimming tutor running courses etc.  This was more important some years ago but she still has some activity although very small.  Income to 5 April 2014 was £70 (I said it was small), expenses, mainly insurance through the Amateur Swimming Association totalled £65 so profit of £5, should give a liability of £2.  Not a lot of course but it could be greater in later years and was greater in earlier years before promotion etc.  Having indicated that she wanted to return expenses as a single sum she indicated yes, inserted the figure, pressed next and... she got a screen which asked if she wanted to delete the self employed section!  And couldn't get out of it, press back, check all of the information, income, expenses all correctly shown but this time we pressed save but - same result - do you want to delete the self employed section?  I made sure she took screen grabs of the offending pages but the only way we could escape this wretched question was to answer yes, complete the return but add in the screen grabs as a pdf file added to the return and copious documentation in the white box section of the return.  Has anyone else come across this bizarre behaviour in the return?  I am not a practitioner and this has never happened before...