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Perhaps define a particular section that it won't let you enter "anything"

 

It shouldn't happen in the Personal Info section

BUT 

(while this may not be the problem...I'll take a flyer and suggest it anyhow)

 

For some $$ entry sections, where you entered "Supporting Details" for an entry last year, you need to take a special step to get it to take a number this year

...sometimes a double-click will do it,

.....sometimes you can click in the box once then and then go to the top menu on the screen and click on <Edit....then <<Add Supporting Details from the drop-down menu.  IF the SuppDet box shows up you can either add your entry in there...or hit the Red "X" to delete the whole SuppDet worksheet and then make your normal entry.

____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*