In my search results for the site at http://www.etables1798.com, everything works wonderfully until I search for very particular words. The first word I noticed is "discerning" (no quotes), where instead of a standard search results I am given either a blank html page or a fatal error that looks something like "Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 65536 bytes) in /home/sisterso/public_html/wp-includes/wp-db.php on line 1121".
Oddly, most other words work correctly, but not all. I can search for "discern" no problem, but searching for "dis" or "discer" or "discerni" leads to the same blank page/fatal error issue.
I tried rebuilding the Relevanssi index and got a fatal error after it had indexed about 600 entries. I was able to build a complete index by going back in and clicking "Continue indexing." However, this made no difference in being able to search for "discerning." I also cleared all caches, but this made no difference either.
Do you have any idea at all what could cause something like this?