Did my weekly rpi-update today and noticed the script was itself updated first. But even if it was called with rpi-udate 192 it uses the 224/32 MB split. Seems it does not honor the mem-split command anymore.
Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS
Using ARM/GPU memory split of 224MB/32MB
Updating firmware (this will take a few minutes)
Using SoftFP libraries
If no errors appeared, your firmware was successfully updated
A reboot is needed to activate the new firmware
Fixed in yesterdays commit.
It seems to be only partially fixed. When the script is called with a mem-split argument and the script is self-updated it seems that when the script calls the "new self" the argument is not passed on.
Calling rpi-update 192 a second time uses the argument correctly.
Ah, yes, that's because the way the arguments were passed after updating changed.
You'll only see that happen once, between those two versions. Future versions shouldn't show the same bug.