I just accidentaly noticed that in Great Britain - Real Life folder (and possibly in others too, but I didn't checked) there is number of files that have underscores instead of spaces in the index filename.
For example (that's the upper-most example, there are many more of these)
http://www.shipbucket.com/images.php?di ... unnels.PNG
CL D52 Enterprise 1926 Short Funnels.png
(I have a painful feeling, that for that and some other reasons, in some time another filename clean-up operation might be needed, similar to that one of spring 2013)