@john_percy: hmm interesting. Locus do not modify default directories and also do not add any directories to "Add external maps", so by any accident, it happen probably on your side. Sorry
@Andrew Heard: I'm trying to simulate your problem and it works fine for me. I have now only 600 MB free on card, I tap on a purchase of whole Germany map (190 LC, required almost 4 GB for download), purchase valid and then appear issue with "not enough free space". But button "Purchase" is still on screen. Button "back" and return to Germany fixed this and now button "Download is visible". (I'll try to fix this).
You have deleted France map manually over some file browser out of Locus, or directly in Locus? Seems like Locus incorrectly noticed that map is removed and offer to you only "update" of older map. Anyway as I see, map was correctly charged only once, right? So except confusion, nothing extra happen. Fine. I'll try to play with it a little bit, so maybe this happen to me as well, so I'll be able to correctly refresh top panel with active buttons. Thanks for report and sorry for these troubles! Hope that map is downloaded and nicely working!