OFB: Can't Assign Chef?

Does anyone know of a hack conflict or issue that came up with later EPs that prevents a business owner from assigning an employee as a chef? This has been happening to me, both pre- and post-reinstall of my game. I have no problem with assigning the lot owner to work as chef, but I believe I need an employee in place so that the lot is functional when visited by another sim.

I did some searching, but turned up nothing (or nothing recent and relevant, anyway — I have a stove on the lot). I'll pull out all my hacks and see if that does anything, but first I'd like to "ask the audience" (lame and outdated joke is lame and outdated. :P) to see if there's a known issue that I'm missing here.

Thanks in advance for your help! ^_^