I have been working to set up the time settings to reflect

I have been working to set up the time settings to reflect 160 minute appointments with a 60 minute break/pad in between each. We operate everyday of the week offering classes at 10 am-12 pm (except Sunday), 1 pm-3 pm, 4 pm-6 pm and 7 pm-9 pm.

I have apparently messed up some setting because I am no longer able to make any adjustments. When I make changes in the time settings and attempt to save it will take several minutes to load and then get a 500 server error page which tells me to check the log but there is nothing reflected in the log from what I can see.

I have made other changes, to the Display Settings Custom Color Set for example, that appear to be saved but are not reflected on my make an appointment page.

Can you tell me what is wrong here? I am hopeful it is not a compatibility issue with my theme.