Bad syntax errors in the c1sus.ini config file were causing the summary pages to crash: a plot type had not been indicated for plots 5 and 6, so I've made these "timeseries."
In the future, please remember to always specify a plot type, e.g.:

BAD:

5 = C1:SUS-ETMX_SUSPIT_INMON.mean,
       C1:SUS-ITMY_SUSPIT_INMON.mean,

GOOD:

3 = C1:SUS-ETMX_SUSPIT_INMON.mean,
       C1:SUS-ITMY_SUSPIT_INMON.mean timeseries

By the way, the pages will continue to be unavailable while I transfer them to the new shared account.