Running CT IDX Pro and seeing blank white pages on site or errors in admin

Those are called “500 errors” and are due to the server being maxed out on resources, most importantly RAM or PHP Memory. Typically your host will have a “Monitoring” panel where you can check the current % of the load on your servers CPU and RAM, you don’t really want either of them near 100% all the time, if they are you have three options in this case:

1. We recommend disabling WP-Cron and creating server-side cron jobs which reduces all the load that WP-Cron causes as it fires on every visitor hit, rather than just running the IDX data retrieval functions every 5 minutes (general MLS data), every hour (all agent/office data), and every 24 hours (expire listing data). This will also increase the overall performance of your site.
2. Go into Settings > CT IDX Pro and tailor back the locations. tighten up the price min/max settings, and if you’re loading sold data set the “Solds Time Period” to 6 months or less otherwise that can quickly fill the database, then use Reset IDX Data
3. Contact your host and scale the server up, and change the PHP memory limit to match.

A good rule of thumb is 1GB of RAM per 3000 records on the site, more on that in CT IDX Pro > Server Health section of the documentation.