Does not object flashing by alt-value

[ASD]

Build 257.7
BUG
Does not work "Flash Object" action in the visibility section of the active object, it used alt-value in expression.
And flashing time does not change even if use expression and no retrieve alt-value.

[AyreGuitar]

Never realised you could use an expression to set the flashing rate - however as your example shows, it stays invisible if using an alt val no matter what values the alt val contains. I tried changing it to just use numbers in the expression (instead of alt val) eg 10, 100, 1000 and 1000000 and they all made it flicker furiously, rather than use the number as 1/1000 of a second. So seems to be very broken! Did this ever work correctly in earlier builds?