The following problem continually happens on two, separate systems (2 separate routers in physically separate locations).
I'm using Tomato Firmware 1.28.0000 MIPSR2-2.9-131 K26AC USB AIO-64K flashed to ASUS RT-AC66U routers. Setup of a guest network on br1 and the VLAN bridge to br1 works as advertised. But when trying to add virtual wireless interfaces, the system hangs at the final "save" step (remains in "Saving …" mode forever). Adding security and viewing the "new" connection appears normal on the "Overview" splash page. Nut when I navigate out of the Virtual Wireless page, nothing is set up. Needless to say, I've tried this in both physically separate locations with the same results. Soft/hard reboots of the routers has no effect.
I'm EXTREMELY impressed with Tomato and if need be will go to another version to correct this fault — but am I missing something? Thanks in advance for your help!