P5 pins no longer work as interrupts

[clrdls]

In March I did an apt-get update, apt-get upgrade, and apt-get dist-upgrade prior to installing database software. I had GPIO 28 on the P5 header programmed as a interrupt callback using RPIO and it stopped working. I noticed one message that said interrupt 50 was disabled in the kernel. I moved the wire to GPIO 11 on the P1 header, edited the program and it worked as before. I checked GPIO 29 on the P5 header and it did not work as an interrupt either. I don't know if the P5 pins work as standard IO points. I assume that the upgrades caused the problem, I2C was also disabled but I was able to turn it back on using raspi-config. Any ideas on how to make the P5 pins usable again?
Thanks

[clrdls]

No response.