I just tried it out. Seems like that's the case. Hope someone can figure a workaround!
My phone, using LightFlow, notified me when the MMS came in but neither Handcent or the Text Messaging app received it when the stock app was disabled.
..edit..
Well, it looks like you can't download MMS while on Wi-Fi. Since when!?[/QUOTE]
since forever, i believe.
handcent alwayslets me know i got an mms while on wifi, but it'll show a little button to download it. so i have to disconnect from my wifi, hook up the 3g/4g, and download the mms. the same goes for sending one. gotta be on 3g/4g.