It seems, that after the latest release of Omnibar, the search with several operators isn't working as expected, f.i.:
The first operator "abc" won't be counted here. Instead, the default search engine will be used. "def" and "ghi" will work though.
So the new version of Omnibar seems to skip the first operator when several operators are present. The same goes for
Hoping for a quick fix and wishing all the best!
PS: Version 0.7.26.20141003 is the last one, where multiple search is working correctly.