Did some experiments for those who might be very desperate. I filled out a bug report with these experiments:
1) Used a generic 30 pin adapter (not by Apple), with vga and power in one adapter. I plugged it into my Ipad. It doesn't work and an error message, "device not supported" pops up. Plugged in the Apple 30 pin vga adapter instead, into my Ipad, doesn't work.
2) Hard reset Ipad.
3) Now, after Ipad has rebooted, now plug into Apple 30 pin VGA adapter into the Ipad, and it works!
As soon as you plug the non Apple vga adapter with power, it doesn't work and complains with error message, "device not supported."
I didn't use the power port of the generic 30 pin adapter, because it didn't make any difference.
Very frustrating ...
Generic 30 pin vga and power in one adapter worked before the update!
Now, again, if you plug in Apple vga adapter, it won't work unless a hard reset is done.
So, if you are in a bind, try the original Apple 30 pin adapter and hard reset your Ipad and see if this helps. It might work for those with lightning connectors, but don't have one to experiment.
Good luck!