Sometimes when I create a prompt and specify that it is to have a range, everything looks fine until I run the report. Then the prompt only appears with a single select, in this case, a single calendar instead of two calendars. I've not been able to tie it to anything specific, although I suspect it may have to do with the underlying model. Does anyone know the why of this behavior? It is frustrating when you think you have a solution to a reporting issue and can't get the range prompt to function as expected.
Well, I figured out the answer to my own question. My filter was using '=' instead of 'in_range'. Silly me.