A gui-initiated search containing common words fails.
A search using the GUI containing common words such as "arm" or "space" turn up zero matches. Searching for those words using the command line succeeds. The GUI term explorer can also find those words. The advanced search can be used to find the words in an abstract, but not elsewhere in the document.
I'm using Recoll 1.19.4 and Xapian 1.2.7.