Rebuilding Persepolis

[Superstorm]

Seem to have run into a problem with Zoroastrian playthrough. Got everything set to rebuild Persepolis but when I click the descion, the event pops up with just the option to "make it grander than it ever was!" choice, but when I click on it, nothing seems to happen, even if I wait for 9 years on the same ruler. Any help? I've got Eshterfan as my capital and everything.

 

[Flavius Ricimer]

I've had this happen too. I think my ruler died, which must have reset the event counter or something. Eventually it did work. Had a good empire, but I lost interest in it...