Looks similar to what I found here ...
OpenCPN for Android Beta test 4.1.909
For me it's clearly related to OpenGL, when switching forth and back (OpenGL on/off).
I don't think it's related to a specific lat/lon, I have it everywhere, since some time with OpenGL on. Can't tell you exactly since when, but after the Android implementation started, I noticed that the current
track only shows the "old-track-colour" but not red with OpenGL on.
So I turned OpenGL off at that time ...
And I really noticed it 2 days ago, see above.
My chart set is unchanged ever since I have it.
I run Win7 with onboard intel graphics, VC2013 and wxWidgets 3.02