I've been monitoring two flights I'm on Wednesday, both "V' class, PHL-IAH-OAK (738/739) Theoretically, EUA should have run 5 days out, on Friday, the day before yesterday. Following are the number of FC seats assigned/total # FC seats.

Fri Sat Sun Monday
PHL-IAH 2/14 2/14 1/14 1/14
IAH-OAK 3/18 3/18 4/18 4/18

So it looks as though EUA is either not running, or perhaps if it is running, it is looking to assign FC seats to only high fare clases and there are none at this time. Obvioulsy, my V fare isn't high enough.
Another theory (possibility) is that CO does not assign a lot of R seats, so that there are none to upgrade into. Given the city pairs and the fact that these are Wed morning flights, its hard to believe, that if the system is working, that CO would not have assigned a reasonable # of R seats to these flights.

Edited to add that I serious question if EUA is down. I have also been following my return this Friday and there has been no movement there. OAK-IAH has stayed at 2/14 and IAH-DTW has stayed at 2/14. THe only flight that has cleared is Friday DTW-PHL and that is on NW metal. Why am I not surprised