Hi Chris
Yes, I am sure. I downloaded today the last version and I tried the RoundLake. I had the same error. It happens when I define sbp_model = true in the oxygen file. if sbp_model = false everything is OK
the erros when sbp_model = true
 
 ***** WARNING **** WARNING **** WARNING **** WARNING ****
 * unknown key temperature_DO_sedflux_multiplier in wq_files/oxygen.dat
 *********************************************************
 
 ***** WARNING **** WARNING **** WARNING **** WARNING ****
 * unknown key DO_sedflux_coefficient in wq_files/oxygen.dat
 *********************************************************
 
 ***** WARNING **** WARNING **** WARNING **** WARNING ****
 * unknown key O2_DO_sedflux_half_saturation in wq_files/oxygen.dat
 ***** WARNING **** WARNING **** WARNING **** WARNING ****
* Fn has not been set for File: DO_ITS_WC.csv
By the way, the datablock.xml has a problem with line 170, I think there is a wrong definition here.
Best
Ricardo RB