I have configured my SciTE 3.7.4 like this:
find.close.on.find=0 find.replace.matchcase=1 find.use.strip=1 find.strip.incremental=1
When I try to find something, I can enter it in the strip, and because of the incremental find, the first occurance is found immediately. Also, the F3 key finds the next occurance. However, clicking on the "Find Next" button has no effect; the next occurance is not searched.
While this area has some complex interactions, the change commited as [5adee9] should fix this particular bug.
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Commit: [5adee9]