SELECTEDVALUE alternate result is calculating correctly but not working with filter

[Anonymous]

I have what i thought was a fairly simple measure to allow a visual to be filtered by selection and default to the current month if nothing is selected: 

the measure works as expected if a month is selected, it even returns the correct value if nothing is selected (checked by putting it in a card) but the visual is not filtering to the defult (current) month if nothing is selected.  i made the default month a variable to see if that would fix and it is still not working -  I'm stuck as to what to try next?

The Measure: 

Selected Month =

VAR defaultmonth =

CALCULATE (

DISTINCT ( DIM_Calendar[MonthYear] ),

DIM_Calendar[CurMonthOffset] = 0

)

RETURN

SELECTEDVALUE ( DIM_Calendar[MonthYear], defaultmonth )

[vapid128]

IF(

DISTINCTCOUNT( DIM_Calendar[MonthYear] )=1,

the correct value,

the defult (current)value

)

[Anonymous]

i tried this and it didnt work, the card now shows blank if nothing is selected: 

Selected Month =
IF (
    DISTINCTCOUNT ( DIM_Calendar[MonthYear] ) = 1,
    SELECTEDVALUE (
        DIM_Calendar[MonthYear],
        CALCULATE (
            DISTINCT ( DIM_Calendar[MonthYear] ),
            DIM_Calendar[CurMonthOffset] = 0
        )
    )
)

[vapid128]

IS this what you want?

[Anonymous]

my measure does that the problem is when the alternate result is returned for selected value it doesnt pass to a filter.   note it is returning the correct value just not filtering.   

i tried to simplify the dax to make it easier to trouble shoot - the full measure is here: 

SelectedMTD cumulative =

VAR selectedmonth =

SELECTEDVALUE ( DIM_Calendar[MonthYear], CALCULATE (

DISTINCT ( DIM_Calendar[MonthYear] ),

DIM_Calendar[CurMonthOffset] = 0

) )

var SignUpsMTD =

CALCULATE (

DISTINCTCOUNT ( training_contracts[SUT ID ] ),

DATESMTD ( DIM_Calendar[Date] ),

DIM_Calendar[MonthYear] = selectedmonth

)

RETURN

IF (

MAX ( DIM_Calendar[Date] ) <= LASTDATE ( training_contracts[tyims_created_on] ),

signupsmtd,

BLANK ()

)

If i select a month it filters correctly: 

if no date is selected it shows all the data: