Created attachment 98705 [details]
Screenshots of dialogues and problem are attached.
When opening an XLSX file that includes a scatter or line chart whose line type is set to 'none', LO does not apply the series' marker colors. This is related to LO's lack of independent marker formatting as described in bug 75822 .
This issue should be resolved when marker formatting is added in 4.3. An interim fix for 4.2.x releases would be to apply the marker color to the line color which is already present. This line color then propagates to the markers.
I have confirmed the bug in LO 188.8.131.52 (Linux) and 4.1.4-4.2.4 (Windows).
Created attachment 98706 [details]
LibreOffice behavior and dialog
Created attachment 98707 [details]
Excel (correct) behavior and dialog
I confirm issue with LibO 184.108.40.206 and 220.127.116.11alpha1+(*)
(*)Build ID: 657004ae5c9f4a07b2cdafbb21bc8657842d4d74
TinderBox: Win-x86@39, Branch:master, Time: 2014-05-08_00:35:12
Seems to be fixed in master.